Countermine :: Countermine (n.) An underground gallery excavated to intercept and destroy the mining of an enemy.
Countermine :: Countermine (n.) A stratagem or plot by which another sratagem or project is defeated.
Countermine :: Countermine (v. t.) To oppose by means of a countermine; to intercept with a countermine.
Countermine :: Countermine (v. t.) To frustrate or counteract by secret measures.
Countermine :: Countermine (v. i.) To make a countermine or counterplot; to plot secretly.