Webster’s Revised Unabridged Dictionary · 1913
Counterplot
Coun′ter·plot′ (koun′t?r-pl?t′), v. t. [imp. & p. p. Counterplotted; p. pr. & vb. n. Counterplotting.] To oppose, as another plot, by plotting; to attempt to frustrate, as a stratagem, by stratagem.
Every wile had proved abortive, every plot had been counterplotted. De Quinsey.
Coun′ter·plot′ (koun′t?r-pl?t′), n. A plot or artifice opposed to another. L'Estrange.