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[trech-uh-ree] /ˈtrɛtʃ ə ri/
noun, plural treacheries.
violation of faith; betrayal of trust; treason.
an act of perfidy, faithlessness, or treason.
1175-1225; Middle English trecherie < Middle French, Old French, equivalent to trech(ier) to deceive + -erie -ery
1. See disloyalty.
1. loyalty.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for treachery
  • He'd heard tales of treachery, duplicity, and outright thuggery.
  • He can devise tales of others' treachery and of the cruelness of fate to explain away his defeat.
  • But their opinions were widely excoriated as treachery and defeatism.
  • He did not mention the local treachery or the lapses of officers who might have helped that day.
  • But their friendly gestures often were rewarded with treachery.
British Dictionary definitions for treachery


noun (pl) -eries
the act or an instance of wilful betrayal
the disposition to betray
Word Origin
C13: from Old French trecherie, from trechier to cheat; compare trick
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for treachery

early 13c., from Old French trecherie "deceit, cheating" (12c.), from trechier "to cheat, deceive" (see trick).

Online Etymology Dictionary, © 2010 Douglas Harper
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