1. (

• countermine

) (military) a tunnel dug to defeat similar activities by the enemy ;

1. (

• sabotage ,
• undermine ,
• countermine ,
• counteract ,
• subvert ,
• weaken

) destroy property or hinder normal operations; "The Resistance sabotaged railroad operations during the war" ;

2. (

• countermine

) destroy enemy mines with one's own mines; "We countermined the banks of the river" ;