Cot–caught merger

The cot–caught merger, also known as the LOT–THOUGHT merger or low back merger, is a sound change present in some dialects of English where speakers do not distinguish the vowel phonemes in words like cot versus caught. Cot and caught (along with bot and bought, pond and pawned, etc.) is an example of a minimal pair that is lost as a result of this sound change. The phonemes involved in the cot–caught merger, the low back vowels, are typically represented in the International Phonetic Alphabet as /ɒ/ and /ɔ/, respectively (or, in North America, co-occurring with the father–bother merger, as /ɑ/ and /ɔ/). The merger is typical of most Canadian and Scottish English dialects as well as some Irish and U.S. English dialects.

Examples of a merged and an unmerged speaker of American English

Non-merged speaker

[kʰäʔ] for cot and [kʰɔʔ] for caught

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Merged speaker

[kʰɑt] for cot and caught alike

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An additional vowel merger, the father–bother merger, which spread through North America in the eighteenth and nineteenth centuries, has resulted today in a three-way merger in which most Canadian and many U.S. accents have no vowel difference in words like PALM /ɑ/, LOT /ɒ/, and THOUGHT /ɔ/. However, /ɔr/ as in NORTH participates in a separate phenomenon in most North American English: the NORTH–FORCE merger, in which this vowel before /r/ can be phonemicized as the GOAT vowel,^[1] transcribed variously thus as /or/^[2] or /oʊr/.^[3]

Overview

IPA: Vowels
Front Central Back Close i   y ɨ   ʉ ɯ   u Near-close ɪ   ʏ   ʊ Close-mid e   ø ɘ   ɵ ɤ   o Mid e̞   ø̞ ə ɤ̞   o̞ Open-mid ɛ   œ ɜ   ɞ ʌ   ɔ Near-open æ   ɐ Open a   ɶ ä   ɑ   ɒ
IPA help   audio full chart template Legend: unrounded • rounded

The shift causes the vowel sound in words like cot, nod and stock and the vowel sound in words like caught, gnawed and stalk to merge into a single phoneme; therefore the pairs cot and caught, stock and stalk, nod and gnawed become perfect homophones, and shock and talk, for example, become perfect rhymes. The cot–caught merger is completed in the following dialects:

• Some English of the British Isles, outside of England:
  • Most Scottish English, towards [ɔ] ( listen)^[4]
  • Broad and traditional Irish English^{[citation needed]}
  • Some northern Ulster English^[4] including in conservative mid Ulster English towards [ä] ( listen) and in Ulster Scots English towards [ɔ] ( listen)^[5][6]
• Much of the English of North America:
  • Certain varieties of American English, including:^[7]
    • Pittsburgh English, towards [ɒ~ɔ] (with the father–bother merger)^[8]
    • Much of New England English towards [ɑ~ɒ] (in Boston, particularly towards [ɒ] ( listen)), and Northern New England generally, but traditionally not Southern New England^[7]
    • Western American English (with the father–bother merger)^[7] towards [ɑ] ( listen)
    • Cajun English, Upper Midwestern English, Chicano English, and some Western New England English (with the father–bother merger) towards [ä] ( listen)^[9]
  • Nearly all Canadian English, including:^[10]
    • Standard Canadian English towards [ɒ] ( listen) (with the father–bother merger)
    • Maritimer and Newfoundland English, towards [ɑ~ä] (with the father–bother merger)
• Much Indian English towards [ɔ] or [ɒ]^[11]
• Some Singaporean English^[12]

Examples of homophonous pairs

/ɑ/ or /ɒ/ (written a, o, ol)	/ɔ/ (written au, aw, al, ough)	IPA (using ⟨ɒ⟩ for the merged vowel^[a])
bobble	bauble	ˈbɒbəl
body	bawdy	ˈbɒdi
bot	bought	ˈbɒt
box	balks	ˈbɒks
chock	chalk	ˈtʃɒk
clod	clawed	ˈklɒd
cock	caulk	ˈkɒk
cod	cawed	ˈkɒd
collar	caller	ˈkɒlə(r)
cot	caught	ˈkɒt
don	dawn	ˈdɒn
fond	fawned	ˈfɒnd
hock	hawk	ˈhɒk
holler	hauler	ˈhɒlə(r)
hottie	haughty	ˈhɒti
knot	nought	ˈnɒt
knotty	naughty	ˈnɒti
nod	gnawed	ˈnɒd
not	nought	ˈnɒt
odd	awed	ˈɒd
pod	pawed	ˈpɒd
pond	pawned	ˈpɒnd
rot	wrought	ˈrɒt
sod	sawed	ˈsɒd
sot	sought	ˈsɒt
stock	stalk	ˈstɒk
tot	taught	ˈtɒt
wok	walk	ˈwɒk

North American English

 

On this map of English-speaking North America, the green dots represent speakers who have completely merged the vowels of cot and caught. The dark blue dots represent speakers who have completely resisted the merger. The medium blue dots represent speakers with a partial merger (either production or perception but not both), and the yellow dots represent speakers with the merger in transition. Based on the work of Labov, Ash and Boberg.^[13]

Nowhere is the shift more complex than in North American English. The presence of the merger and its absence are both found in many different regions of the North American continent, where it has been studied in greatest depth, and in both urban and rural environments. The symbols traditionally used to transcribe the vowels in the words cot and caught as spoken in American English are ⟨ɑ⟩ and ⟨ɔ⟩, respectively, although their precise phonetic values may vary, as does the phonetic value of the merged vowel in the regions where the merger occurs.

Even without taking into account the mobility of the American population, the distribution of the merger is still complex; there are pockets of speakers with the merger in areas that lack it, and vice versa. There are areas where the merger has only partially occurred, or is in a state of transition. For example, based on research directed by William Labov (using telephone surveys) in the 1990s, younger speakers in Kansas, Nebraska, and the Dakotas exhibited the merger while speakers older than 40 typically did not.^[14][15] The 2003 Harvard Dialect Survey, in which subjects did not necessarily grow up in the place they identified as the source of their dialect features, indicates that there are speakers of both merging and contrast-preserving accents throughout the country, though the basic isoglosses are almost identical to those revealed by Labov's 1996 telephone survey. Both surveys indicate that, as of the 1990s, approximately 60% of American English speakers preserved the contrast, while approximately 40% merged the phonemes. Further complicating matters are speakers who merge the phonemes in some contexts but not others, or merge them when the words are spoken unstressed or casually but not when they're stressed.

Speakers with the merger in northeastern New England still maintain a phonemic distinction between a fronted and unrounded /ɑ/ (phonetically [ä]) and a back and usually rounded /ɔ/ (phonetically [ɒ]), because in northeastern New England (unlike in Canada and the Western United States), the cot–caught merger occurred without the father–bother merger. Thus, although northeastern New Englanders pronounce both cot and caught as [kɒt], they pronounce cart as [kät].

Labov et al. also reveal that, for about 15% of respondents, a specific /ɑ/–/ɔ/ merger before /n/ but not before /t/ (or other consonants) is in effect, so that Don and dawn are homophonous, but cot and caught are not. In this case, a distinct vowel shift (which overlaps with the cot–caught merger for all speakers who have indeed completed the cot–caught merger) is taking place, identified as the Don–dawn merger.^[16]

Resistance

According to Labov, Ash, and Boberg,^[17] the merger in North America is most strongly resisted in three regions:

• The "South", somewhat excluding Texas and Florida.
• The "Inland North", encompassing the eastern and central Great Lakes region (on the U.S. side of the border)
• The "Northeast Corridor" along the Atlantic coast, ranging from Baltimore to Philadelphia to New York City to Providence. However, the merger is common in Boston and further northern New England.

In the three American regions above, sociolinguists have studied three phonetic shifts that can explain their resistance to the merger. The first is the fronting of /ɑ/ found in the Inland North; speakers advance the LOT vowel /ɑ/ as far as the cardinal [a] (the open front unrounded vowel), thus allowing the THOUGHT vowel /ɔ/ to lower into the phonetic environment of [ɑ] without any merger taking place.^[18] The second situation is the raising of the THOUGHT vowel /ɔ/ found in the New York City, Philadelphia and Baltimore accents, in which the vowel is raised and diphthongized to [ɔə⁓oə], or, less commonly, [ʊə], thus keeping that vowel notably distinct from the LOT vowel /ɑ/.^[18] The third situation occurs in the South, in which vowel breaking results in /ɔ/ being pronounced as upgliding [ɒʊ], keeping it distinct from /ɑ/.^[18] None of these three phonetic shifts, however, is certain to preserve the contrast for all speakers in these regions. Some speakers in all three regions, particularly younger ones, are beginning to exhibit the merger despite the fact that each region's phonetics should theoretically block it.^{[citation needed]}

African American Vernacular English accents have traditionally resisted the cot–caught merger, with LOT pronounced [ɑ̈] and THOUGHT traditionally pronounced [ɒɔ], though now often [ɒ~ɔə]. Early 2000s research has shown that this resistance may continue to be reinforced by the fronting of LOT, linked through a chain shift of vowels to the raising of the TRAP, DRESS, and perhaps KIT vowels. This chain shift is called the "African American Shift".^[19] However, there is still evidence of AAVE speakers picking up the cot–caught merger in Pittsburgh, Pennsylvania,^[20] in Charleston, South Carolina,^[21] Florida and Georgia,^[22] and in parts of California.^[22]

Origin

In North America, the first evidence of the merger (or its initial conditions) comes from western Pennsylvania as far back as the data show.^[23] From there, it entered Upper Canada (what is now Ontario). In the mid-19th century, the merger also independently began in eastern New England,^[24] possibly influencing the Canadian Maritimes, though the merger is in evidence as early as the 1830s in both regions of Canada: Ontario and the Maritimes.^[25] Fifty years later, the merger "was already more established in Canada" than in its two U.S. places of origin.^[25] In Canadian English, further westward spread was completed more quickly than in English of the United States.

Two traditional theories of the merger's origins have been longstanding in linguistics: one group of scholars argues for an independent North American development, while others argue for contact-induced language change via Scots-Irish or Scottish immigrants to North America. In fact, both theories may be true but for different regions. The merger's appearance in western Pennsylvania is better explained as an effect of Scots-Irish settlement,^[26] but in eastern New England,^[24] and perhaps the American West,^[27] as an internal structural development. Canadian linguist Charles Boberg considers the issue unresolved.^[28] A third theory has been used to explain the merger's appearance specifically in northeastern Pennsylvania: an influx of Polish- and other Slavic-language speakers whose learner English failed to maintain the distinction.^[29]

England

In London's Cockney accent, a cot–caught merger is possible only in rapid speech. The THOUGHT vowel has two phonemically distinct variants: closer /oː/ (phonetically [oː ~ oʊ ~ ɔo]) and more open /ɔə/ (phonetically [ɔə ~ ɔwə ~ ɔː]). The more open variant is sometimes neutralized in rapid speech with the LOT vowel /ɒ/ (phonetically [ɒ ~ ɔ]) in utterances such as [sˈfɔðɛn] (phonemically /ɑɪ wəz ˈfɔə ðen/) for I was four then. Otherwise /ɔə/ is still readily distinguished from /ɒ/ by length.^[30]

Scotland

Outside North America, another dialect featuring the merger is Scottish English. Like in New England English, the cot–caught merger occurred without the father–bother merger. Therefore, speakers still retain the distinction between /a/ and /ɔ/.

See also

• Phonological history of English open back vowels

Notes

1. Except for pairs that only apply to accents that also have the father–bother merger, for which /ɑ/ is used.

References

1. Wells (1982), p. 479.
2. Kenyon, John S.; Thomas A. Knott (1949) [1943]. A Pronouncing Dictionary of American English. Springfield, Mass.: G. & C. Merriam. ISBN 0-87779-047-7.
3. "ore". Dictionary.com Unabridged (Online). 2023.
4. Wells 1982, p. ?
5. Heggarty, Paul; et al., eds. (2013). "Accents of English from Around the World". University of Edinburgh. Retrieved 2016-12-12.
6. Wells 1982, p. 438
7. Labov, Ash & Boberg (2006), pp. 60–1
8. Gagnon, C. L. (1999). Language attitudes in Pittsburgh: 'Pittsburghese' vs. standard English. Master's thesis. Pittsburgh: University of Pittsburgh.
9. Dubois, Sylvia; Horvath, Barbara (2004). "Cajun Vernacular English: phonology". In Kortmann, Bernd; Schneider, Edgar W. (eds.). A Handbook of Varieties of English: A Multimedia Reference Tool. New York: Mouton de Gruyter. pp. 409–10.
10. Labov, Ash & Boberg (2006), p. 218
11. Wells 1982, p. 626
12. "Singapore English" (PDF). Videoweb.nie.edu.sg. Retrieved 2016-12-12.
13. Labov, Ash & Boberg (2006), p. 122
14. Gordon (2005)
15. "Map 1". Ling.upenn.edu. Retrieved 2016-12-12.
16. Labov, Ash & Boberg (2006), p. 217
17. Labov, Ash & Boberg (2006), pp. 56–65
18. Labov, Ash & Boberg (2006), chpt. 11
19. Thomas, Erik R. (September 2007). "Phonological and Phonetic Characteristics of African American Vernacular English: Phonological and Phonetic Characteristics of AAVE". Language and Linguistics Compass. 1 (5): 450–475. doi:10.1111/j.1749-818X.2007.00029.x.
20. Eberhardt (2008).
21. Baranowski (2013).
22. Jones (2020), p. 165.
23. Johnson, D. E., Durian, D., & Hickey, R. (2017). New England. Listening to the Past: Audio Records of Accents of English, 234.
24. Johnson, Daniel Ezra (2010). "LOW VOWELS OF NEW ENGLAND: HISTORY AND DEVELOPMENT". Publication of the American Dialect Society 95 (1): 13–41. doi: https://doi.org/10.1215/-95-1-13. p. 40.
25. Dollinger, Stefan (2010). "Written sources of Canadian English: phonetic reconstruction and the low-back vowel merger". Academia.edu. Retrieved 2016-03-19.
26. Evanini, Keelan (2009). "The permeability of dialect boundaries: A case study of the region surrounding Erie, Pennsylvania". University of Pennsylvania; dissertations available from ProQuest. AAI3405374. pp. 254-255.
27. Grama, James; Kennedy, Robert (2019). "2. Dimensions of Variance and Contrast in the Low Back Merger and the Low-Back-Merger Shift". The Publication of the American Dialect Society. 104, p. 47.
28. Boberg, Charles (2010). The English language in Canada. Cambridge: Cambridge. pp. 199?.
29. Herold, Ruth. (1990). "Mechanisms of merger: The implementation and distribution of the low back merger in eastern Pennsylvania". Doctoral dissertation, University of Pennsylvania.
30. Wells 1982, pp. 305, 310, 318–319

Bibliography

• Baranowski, Maciej (2013), "Ethnicity and Sound Change: African American English in Charleston, SC", University of Pennsylvania Working Papers in Linguistics, 19 (2): 1–10, S2CID 2034660
• Barber, Charles Laurence (1997). Early modern English (second ed.). Edinburgh: Edinburgh University Press. ISBN 0-7486-0835-4.
• Eberhardt, Maeve (2008), "The Low-Back Merger in the Steel City: African American English in Pittsburgh", American Speech, 83 (3): 284–311, doi:10.1215/00031283-2008-021
• Gordon, Matthew J. (2005), "The Midwest Accent", American Varieties, PBS, retrieved August 29, 2010
• Jones, Taylor (1 January 2020). Variation in African American English: The Great Migration and Regional Differentiation (PDF) (Thesis). ProQuest 2423437304.
• Labov, William; Ash, Sharon; Boberg, Charles (2006). The Atlas of North American English: Phonetics, Phonology, and Sound Change: a Multimedia Reference Tool. Berlin ; New York: Walter de Gruyter. ISBN 3-11-016746-8.
• Wells, John C. (1982), Accents of English, Vol. 2: The British Isles (pp. i–xx, 279–466), Cambridge University Press, ISBN 0-52128540-2 

External links

• Map of the cot–caught merger from Labov's 1996 telephone survey
• Description of the cot–caught merger in the Phonological Atlas
• Map of the cot–caught merger before /n/ and /t/
• Chapter 13 of the Atlas of North American English, which discusses the "short-o" configuration of various American accents