The Collaborative International Dictionary of English v.0.48:

Cozen \Coz"en\, v. i.
   To deceive; to cheat; to act deceitfully.
   [1913 Webster]

         Some cogging, cozening slave.            --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Cozen \Coz"en\ (k?z"'n), v. t. [imp. & p. p. Cozened (-'nd);
   p. pr. & vb. n. Cozening (-'n-?ng). ] [From cousin, hence,
   literally, to deceive through pretext of relationship, F.
   cousiner.]
   To cheat; to defraud; to beguile; to deceive, usually by
   small arts, or in a pitiful way.
   [1913 Webster]

         He had cozened the world by fine phrases. --Macaulay.
   [1913 Webster]

         Children may be cozened into a knowledge of the
         letters.                                 --Locke.
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         Goring loved no man so well but that he would cozen
         him,
         and expose him to public mirth for having been cozened.
                                                  --Clarendon.
   [1913 Webster]

WordNet (r) 3.0 (2006):

cozen
    v 1: be false to; be dishonest with [syn: deceive, lead on,
         delude, cozen]
    2: act with artful deceit
    3: cheat or trick; "He cozened the money out of the old man"

Moby Thesaurus II by Grady Ward, 1.0:

58 Moby Thesaurus words for "cozen":
   beat, beguile, beguile of, betray, bilk, bunco, burn, cheat,
   chisel, chouse, chouse out of, cog, cog the dice, con, crib,
   defraud, delude, diddle, do, do in, do out of, double-cross,
   euchre, finagle, flam, fleece, flimflam, fob, fudge, gouge, gull,
   gyp, have, hocus, hocus-pocus, humbug, mislead, mulct, overreach,
   pack the deal, pigeon, practice fraud upon, rook, scam, screw,
   sell gold bricks, sell out, shave, shortchange, stack the cards,
   stick, sting, swindle, take a dive, take in, thimblerig,
   throw a fight, victimize