Countermine

Part of speech: noun (n.)

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

2. A stratagem or plot by which another sratagem or project is defeated. Thinking himself contemned, knowing no countermine against contempt but terror. Sir P. Sidney.

Part of speech: verb (v.)

1. To oppose by means or a countermine; to intercept with a countermine.

2. To frustrate or counteract by secret measures.

Part of speech: verb (v.)

To make a countermine or counterplot; to plot secretly. 'Tis hard for man to countermine with God. Chapman.