The Collaborative International Dictionary of English v.0.48:

Complot \Com*plot"\, v. t. & i. [imp. & p. p. Complotted; p.
   pr. & vb. n. Complotting.] [Cf. F. comploter, fr. complot.]
   To plot or plan together; to conspire; to join in a secret
   design.
   [1913 Webster]

         We find them complotting together, and contriving a new
         scene of miseries to the Trojans.        --Pope.
   [1913 Webster]