The Collaborative International Dictionary
Countermining
Countermine \Coun`ter*mine"\ (koun`t[~e]r*m[imac]n"), v. t. [Cf. F. contreminer.] [imp. & p. p. Countermined; p. pr. & vb. n. Countermining.]
(Mil.) To oppose by means of a countermine; to intercept with a countermine.
To frustrate or counteract by secret measures.
Wiktionary
countermining
vb. (present participle of countermine English)
Usage examples of "countermining".
Whilst they played wits against me, against me who commanded nations, and intrigued for them, and fought for them, hundreds of years before they were born, I was countermining them.
The countermining operations of the men of Ar had apparently been desultory or incompetent.