Source : Webster's Revised Unabridged Dictionary (1913)

Covin \Cov"in\ (k?v"?n), n. [OF. covine, covaine, fr. covenir to
   agree. See {Covenant}.]
   1. (Law) A collusive agreement between two or more persons to
      prejudice a third.

   2. Deceit; fraud; artifice. [Obs.] --Chaucer.