n. a person who betrays someone. (Often with dirty. See comments at double cross.) : You dirty, lowdown double-crosser, you!
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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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.
[duhb-uh
l-kraws, -kros] 