Longman Dictionary of Contemporary English homepage

undermine

 verb
     
un‧der‧mine [transitive]
to gradually make someone or something less strong or effective:
economic policies that threaten to undermine the health care system
undermine somebody's confidence/authority/position/credibility etc
The constant criticism was beginning to undermine her confidence.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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