double-cross

From King Dictionary of Contemporary Englishdouble-crossˌdouble-ˈcross verb [transitive] CHEATto cheat someone, especially after you have agreed to do something dishonest with themdouble cross noun [countable]double-crosser noun [countable]→ See Verb table
Examples from the Corpus
double-crossHe was killed for double-crossing his Mob bosses.I'm warning you - if you double-cross me, I'll kill you.Harry and Danny double-crossed the gang and escaped with all the money.
From King Business Dictionarydouble-crossˌdouble-ˈcross verb [transitive] to cheat someone who you are involved in an illegal or dishonest activity withHe was living in fear of drug traffickers he had double-crossed.→ See Verb table