One who combines with a sharper to draw in a friend; also, to counteract or disappoint. Cant.—This is peculiarly used to signify entrapping a man so as to obtain CRIM. CON. MONEY, in which the wife, real or supposed, conspires with the husband.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
See also the definition in Nathan Bailey's 1736 dictionary of canting and thieving slang.
Cross Dishonest * Cross ButtockNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes