COVIN

covin. Covin, n. a deceitful agreement, collusion, deceit

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Cov″in (k?v″?n), n. [[OF. covine, covaine, fr. covenir to agree. See Covenant.]] 1. 1. (Law) A collusive agreement between two or more persons to prejudice a third.
2. 2. Deceit; fraud; artifice. Chaucer.