'double-crosser' definitions:

Definition of 'double-crosser'

(from WordNet)
noun
A person who says one thing and does another [syn: double- crosser, double-dealer, two-timer, betrayer, traitor]

Definition of 'double-crosser'

From: GCIDE
  • double-crosser \double-crosser\ n. one who double-crosses another; a person who says one thing and does another.
  • Syn: double-dealer, betrayer, traitor. [WordNet 1.5]