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Webster's New World College Dictionary » undermine
undermine
undermine definition
under·mine (un′dər mīn′, un′dər mīn′)
transitive verb undermined -·mined′, undermining -·min′·ing
- to dig beneath; excavate ground from under, so as to form a tunnel or mine
- to wear away and weaken the supports of erosion is undermining the wall
- to injure, weaken, or impair, esp. by subtle, stealthy, or insidious means
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