How To Pronounce Underline

The stress in underline moves depending on how the word is used.

Noun. It is /ˈʌn.də.laɪn/ in British English and /ˈʌn.dər.laɪn/ in American English with the main stress on the first syllable, as in “an underline”.

Verb. It is /ˌʌn.dəˈlaɪn/ in British English and /ˌʌn.dərˈlaɪn/ in American English with the main stress on the third syllable, as in “to underline”.

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.