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Definition of undermine

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un·der·mine  audio  (ndr-mn) KEY  

TRANSITIVE VERB:
un·der·mined , un·der·min·ing , un·der·mines
  1. To weaken by wearing away a base or foundation: Water has undermined the stone foundations.
  2. To weaken, injure, or impair, often by degrees or imperceptibly; sap: Late hours can undermine one's health.
  3. To dig a mine or tunnel beneath.



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The American Heritage® Dictionary of the English Language, Fourth Edition.
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