undermine

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undermine /ˌʌndɚˈmaɪn/ verb
undermines; undermined; undermining
undermine
/ˌʌndɚˈmaɪn/
verb
undermines; undermined; undermining
Learner's definition of UNDERMINE
[+ object]
: to make (someone or something) weaker or less effective usually in a secret or gradual way