How to pronounce thumb in American English

IPA /θʌm/ Syllables 1 · thuhm Stress 1st syllable

THUHM

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Americans pronounce thumb as THUHM (/θʌm/).

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Is the American pronunciation of "thumb" different from British English?

American English uses different vowel shapes, a relaxed retroflex R, and connected-speech tricks like flap-T and glottal-stop T that British Received Pronunciation generally avoids. The respell "THUHM" reflects the casual American form; British dictionaries typically print a citation form with crisper consonants and different vowel choices.

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