The Collaborative International Dictionary
Countermined
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
countermined
vb. (en-past of: countermine)
Usage examples of "countermined".
If I had had any but a unnat'ral wife, and this poor boy had had any but a unnat'ral mother, I might have made some money last week instead of being counterprayed and countermined and religiously circumwented into the worst of luck.
We mined the organisation of the Iron Heel with our secret agents, and the Iron Heel countermined with its secret agents inside its own organisation.