#1
countermine n. (military) a tunnel dug to defeat similar activities by the enemy
. wn #2
countermine v. [
sabotage, undermine, counteract, subvert, weaken] destroy property or hinder normal operations; "The Resistance sabotaged railroad operations during the war"
. wn #3
countermine v. destroy enemy mines with one's own mines; "We countermined the banks of the river"
. wn