treachery

[trech-uh-ree] Origin

treach·er·y

[trech-uh-ree]
noun, plural treach·er·ies.
1.
violation of faith; betrayal of trust; treason.
2.
an act of perfidy, faithlessness, or treason.

Origin:
1175–1225; Middle English trecherie < Middle French, Old French, equivalent to trech(ier) to deceive + -erie -ery


1. See disloyalty.


1. loyalty.

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Treachery is always a great word to know.
So is flibbertigibbet. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a chattering or flighty, light-headed person.
Collins
World English Dictionary
treachery (ˈtrɛtʃərɪ)
 
n , pl -eries
1.  the act or an instance of wilful betrayal
2.  the disposition to betray
 
[C13: from Old French trecherie, from trechier to cheat; compare trick]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

treachery
early 13c., from O.Fr. trecherie "deceit, cheating" (12c.), from trechier "to cheat, deceive" (see trick).
Online Etymology Dictionary, © 2010 Douglas Harper
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