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1. Double-Cross
To break a promise in a way that harms the person with whom the deal was originally struck. To double-cross is to back-stab and to two-time.

Also, double-crossing can be merely 'ratting' someone out.
Vic was double-crossed by his friend Alan, who informed Nelson Fingers of the upcoming deal.
by Diggity Monkeez Feb 13, 2005 add a video
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