1. a tunnel dug to intercept or destroy an enemy’s mine
Usage: military; historical

1. to dig a countermine against an enemy’s mining operations
Usage: military; historical
2. to defeat or frustrate by secret or underhanded means

Examples

• The defenders dug a countermine to intercept the enemy’s tunnel.
• Engineers worked frantically to countermine the approaching threat.
• The castle’s defenders used countermines to protect against siege warfare.
• She tried to countermine his political campaign through careful maneuvering.
• The rival company attempted to countermine our marketing strategy.
• Historical accounts describe elaborate countermine systems in medieval fortifications.