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.

Coun`ter*mine" (koun`t&etilde;r*mīn"), v. t. [Cf. F. contreminer.] [imp. & p. p. Countermined; p. pr. & vb. n. Countermining.] 1. (Mil.) To oppose by means of a countermine; to intercept with a countermine.