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Undermine

ˌʌndəˈmʌɪn

Undermine definitions
verb
undermine undermined undermines undermining
  1. erode the base or foundation of (a rock formation)

    "the flow of water had undermined pillars supporting the roof"

    erode wear away eat away at chip away undercut
    • dig or excavate beneath (a building or fortification) so as to make it collapse

      "the demolition engineers did eventually undermine two of the tower's six sides"

  2. lessen the effectiveness, power, or ability of, especially gradually or insidiously

    "this could undermine years of hard work"