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undermine

verb [T]
 
 
/ˌʌn.dəˈmaɪn/ US  /-dɚ-/

Definition

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.Upsetting and destabilizing
(Definition of undermine verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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