American English

Definition of undermine verb from the Oxford Advanced American Dictionary



    , NAmE//ˌʌndərˈmaɪn//
    Verb Forms present simple I / you / we / they undermine
    he / she / it undermines
    past simple undermined
    -ing form undermining
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  1. 1undermine something to make something, especially someone's confidence or authority, gradually weaker or less effective Our confidence in the team has been seriously undermined by their recent defeats. This crisis has undermined his position. Recent changes have undermined teachers' morale.
  2. 2undermine something to make something weaker at the base, for example by digging under it
See the Oxford Advanced Learner's Dictionary entry: undermine