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Caught vs. Cot: The Vowel Pair American English Quietly Merged (But Yours Might Not Be Merged Yet)

If most of your listening practice has come from American shows and YouTube pronunciation channels, you've probably absorbed a quiet assumption: cot and caught sound basically the same, and the vowel in law isn't really different from the one in lot. So you learn them as one sound and move on, figuring "native speakers don't seem to bother distinguishing them either."

Switch to a British recording, a dictionary's IPA entry, or an IELTS listening section, and that assumption falls apart immediately. /ɒ/ and /ɔː/ show up as two clearly separate vowels, and mixing them up means mishearing real words or being misheard yourself.

You're not imagining the overlap — it's a real merger, just not a universal one

This one is called the cot–caught merger, and it's genuinely present in a large chunk of American accents — California, Canada, and a growing number of other regions have folded /ɒ/ and /ɔː/ into a single vowel. But that's one accent family among several. General British (RP) keeps them fully separate, and so do plenty of American accents (parts of the Northeast, the South). Dictionary IPA follows the distinct-vowel system, because that's still the standard most learning materials, exams, and a majority of English varieties assume.

/ɒ/ — short, open jaw, no held length

Lips lightly rounded, jaw dropped fairly open, the sound cut short almost as soon as it starts. Found in: cot /kɒt/, lot /lɒt/, top /tɒp/, not /nɒt/, stock /stɒk/, collar /ˈkɒlə/, wok /wɒk/.

/ɔː/ — long, lips rounded and pushed forward

Lips rounded more tightly and pushed forward, tongue slightly higher and further back, and the vowel is held noticeably longer — that length mark /ː/ isn't decorative, it's telling you to hold the sound. Found in: caught /kɔːt/, law /lɔː/, walk /wɔːk/, bought /bɔːt/, stalk /stɔːk/, caller /ˈkɔːlə/.

Minimal pairs to drill side by side

Why it's worth the trouble

If your ear only trained on merged-accent audio, there's a real chance you've genuinely never noticed a difference. Switch to British material, or sit a formal listening exam, and wok and walk, or law and lot, start colliding — you mishear words you actually know, or say a different word than the one you meant, and it's not because the other side is being difficult. It's a contrast you simply haven't practiced.

How to practise it

Start by exaggerating /ɔː/ — hold it for a full beat longer than feels natural and feel your lips actively round and push forward. Then go back to /ɒ/ and let the jaw drop open with no held length at all. Run through the pairs above back to back — cot, caught, cot, caught — until your mouth registers these as two distinct shapes, then bring it back to normal speed.

Not sure whether a word takes the short /ɒ/ or the held-out /ɔː/? PHONO reads any English text through your camera and marks every word with IPA, including vowel length, with both US and UK audio so you can hear exactly which pairs are — and aren't — merged.
Download: https://apps.apple.com/us/app/phono-english-phonetics-ipa/id6783243417 · phono.douhouse.com