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Countermine

n.
  1. (Mil.) An underground gallery excavated to intercept and destroy the mining of an enemy.
  2. A stratagem or plot by which another sratagem or project is defeated.

v. t.
  1. (Mil.) To oppose by means of a countermine; to intercept with a countermine.
  2. To frustrate or counteract by secret measures.

v. i.
  1. To make a countermine or counterplot; to plot secretly.