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underlet
underlie
underline
underlinen
underling
underlip
underlying
undermentioned
undermine
undermost
underneath
undernourish
undernourished
underpainting
underpants
underpart
underparts
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undermine

un·der·mine [ ùndər mn, úndər mn ] (past and past participle un·der·mined, present participle un·der·min·ing, 3rd person present singular un·der·mines)


transitive verb 
Definition:
 
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.

2. weaken something gradually: to diminish or weaken something gradually
undermined her confidence

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.

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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