A person who has betrayed or swindled friends, allies, colleagues, or associates, or intends to do so. Sometimes hyphenated. I'll make sure that dirty double crosser never works in this town again, if it's the last thing I do.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
n. a person who betrays someone. (Often with dirty. See comments at double cross.) You dirty, lowdown double-crosser, you!
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.