How To Pronounce Thumb

In British English, thumb is pronounced /θʌm/. The narrow phonetic transcription is [θʌ̃m]. In American English, it is pronounced /θʌm/.

Thumb has one syllable. British and American speakers say it the same way.

Slashes / / show the phonemic transcription, the sounds that change meaning. Square brackets [ ] show the phonetic transcription, with the finer detail of how the sounds are actually made.