\Treach"er*y\, n. [OE. trecher["i]e, trichere, OF.
trecherie, tricherie, F. tricherie trickery, from tricher to
cheat, to trick, OF. trichier, trechier; probably of Teutonic
origin. See {Trickery}, {Trick}.]
Violation of allegiance or of faith and confidence;
treasonable or perfidious conduct; perfidy; treason.
   Be ware, ye lords, of their treachery.      --Chaucer.
   In the council chamber at Edinburgh, he had contracted a
   deep taint of treachery and corruption.     --Macaulay.