In casual American English, "That's definitely not what I meant" sounds like "dhats DEH-fuh-nuht-lee NAHT wuht ahy MEHNT". Three things happen here, and the headline one is the Unreleased Stops: the final stop consonant closes without a puff of air. Keep stressed words long, unstressed words short, and link the consonants forward into the vowels.
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What makes this sentence sound American.
In "definitely", the "" is not released — the articulators get into position but hold without the burst of air. This is called the Unreleased Stops, a hallmark of natural-sounding American speech. It comes out as DEH-fuh-nuht-lee.
What's happening in this sentence.
Small tricks that turn a textbook sentence into how an American actually says it.
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Common pronunciation mistakes in American English.
The textbook way isn't wrong — it's just not how anyone actually says it.
Releasing the final consonant with a puff of air.
In "definitely", the "" is not released — the articulators get into position but hold without the burst of air. Air stops but there's no release burst — the articulators hold position.
Hard T at the end of a word, not a flap.
The "t" at the end of "" links to the vowel starting "" — it flaps to sound like a quick "d", with the tongue briefly tapping the ridge behind the upper teeth. Same flap as within-word (R1) but spanning two words.
Pronouncing the vowel inside the contraction.
In fast speech, the vowel in "that's" vanishes — the "ih" is completely elided, leaving only a quick "ts" cluster — this is a feature of casual, connected speech; in careful speech, the vowel is retained. In single-syllable -ts contractions (it's = it + is, that's = that + is, what's = what + is, let's = let + us), the unstressed vowel of the enclitic ("is" /ɪ/ or "us" /ə/) is completely elided in fast speech, leaving only the final /ts/ cluster.