Definition of "countermine" []

• To frustrate or defeat by secret and opposite measures. (verb-transitive)
• To make or use a countermine against. (verb-transitive)
• To make or lay down countermines. (verb-intransitive)
• A tunnel dug to intercept and destroy an enemy's mine. (noun)
• A plot to frustrate or defeat an attack. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Keep a good lookout for the countermine which is now working against the good advice of his Majesty for mutual toleration."
• "Mingle in their follies, and see they cover not deeper designs under the appearance of female levity — if they do mine, do thou countermine."
• "Post-cold-war subjects have been inserted into the curriculum, such as "countermine operations," to instruct Central American soldiers on clearing the 130,000 mines laid during the wars of the 1980s, and "resource management," a euphemism for teaching Latin officers to keep their hands out of the till."