double-crosser

double-cross

[duhb-uhl-kraws, -kros]
verb (used with object) Informal.
to prove treacherous to; betray or swindle, as by a double cross.

Origin:
1900–05

double-crosser, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
double-cross
 
vb
1.  (tr) to cheat or betray
 
n
2.  the act or an instance of double-crossing; betrayal
 
'double-'crosser
 
n

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

double-cross
1834, from double + cross in the sense of "pre-arranged swindle or fix." Originally to win a race after promising to lose it.
Online Etymology Dictionary, © 2010 Douglas Harper
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Synonyms
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