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Definition of undermine:

  1. Fig.: To remove the foundation or support of by clandestine means; to ruin in an underhand way; as, to undermine reputation; to undermine the constitution of the state.
  2. To excavate the earth beneath, or the part of, especially for the purpose of causing to fall or be overthrown; to form a mine under; to sap; as, to undermine a wall.


demoralize, enervate, misdirect, countervail, overthrow, unnerve, dig out, attack, subvert, strong, soften, demoralise, debilitate, dampen, counterbalance, de-escalate, undo, spelunk, dig, tunnel, attenuate, countermine, corrupt, pervert, deprave, debauch, devitalize, break, antagonise, antagonize, profane, bring down, weaken, counteract, sabotage, step down, debase, overturn, countercheck, cave, damp.

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