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undermine

From Wiktionary

Word parts

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under- + mine

Pronunciation

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Verb

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Plain form
undermine

Third-person singular
undermines

Past tense
undermined

Past participle
undermined

Present participle
undermining

  1. Someone or something undermines something when they make it difficult for it to happen.
    When you yell at people, it undermines our attempt to get these people to be friendly with each other.
  2. Someone or something undermines something when they dig under it, maybe making it fall.
    When it rained, the fast-moving part of the river came too close to the house and undermined one of its walls.
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