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English definition of “undermine”

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undermine

verb [T] uk   /ˌʌn.dəˈmaɪn/ us    /-dɚ-/
C2 to make someone less confident, less powerful, or less likely to succeed, or to make something weaker, often gradually: The president has accused two cabinet ministers of working secretly to undermine his position/him. Criticism just undermines their confidence.
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(Definition of undermine from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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