The word "undermine" in English means: To weaken or damage something, especially gradually or insidiously., To make someone less confident, less powerful, or less likely to succeed, or to make something weaker, often gradually., To dig or excavate underneath (a building or natural feature) so as to make it collapse or be in danger of collapsing..
The phonetic transcription of "undermine" is /ˌʌndəˈmaɪn/ in British English and /ˌʌndərˈmaɪn/ in American English. Click the 🔊 button to hear both pronunciations.