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| un·der·mine [ ùndər mn, úndər mn ] (past and past participle un·der·mined, present participle un·der·min·ing, 3rd person present singular un·der·mines) |
transitive verb |
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1. erode something: to weaken something by removing or wearing away material from its base or from beneath it
 The chalk cliffs are being gradually undermined by the waves.
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2. weaken something gradually: to diminish or weaken something gradually
undermined her confidence
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3. subvert somebody or something: to weaken, discredit, or destroy somebody or something by covert and malicious action
The leaked memos undermined the administration's credibility.
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4. tunnel under something: to dig a tunnel underneath something, especially a fortification, in order to plant explosives or make it collapse
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