1. (n.) An underground gallery excavated to intercept and destroy the mining of an enemy.

2. (n.) A stratagem or plot by which another stratagem or project is defeated.

3. (v. t.) To oppose by means of a countermine; to intercept with a countermine.

4. (v. t.) To frustrate or counteract by secret measures.

5. (v. i.) To make a countermine or counterplot; to plot secretly.

abri angle approach trench brew bunker cabal collude communication trench complot concoct connive conspire cook up counterplot coupure ditch double sap dugout engineer entrenchment finagle finesse fire trench flying sap fortified tunnel fosse foxhole frame frame up gallery hatch hatch a plot hatch up intrigue lay a plot machinate maneuver mine moat operate parallel plot rig sap scheme slit trench trench tunnel wangle