n. [ Counter- + mine underground gallery: cf. F. contermine. ] 1. (Mil.) An underground gallery excavated to intercept and destroy the mining of an enemy. [ 1913 Webster ]

2. A stratagem or plot by which another sratagem or project is defeated. [ 1913 Webster ]

Thinking himself contemned, knowing no countermine against contempt but terror. Sir P. Sidney. [ 1913 Webster ]

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. [ 1913 Webster ]

2. To frustrate or counteract by secret measures. [ 1913 Webster ]

v. i. To make a countermine or counterplot; to plot secretly. [ 1913 Webster ]

'Tis hard for man to countermine with God. Chapman. [ 1913 Webster ]