BETRAY, be disloyal to, be unfaithful to, desert, break one's promise to, double-cross, break faith with, sell out, play false, inform on/against; informal tell on, sell down the river, squeal on, stitch up, peach on, do the dirty on; Brit. informal grass on, shop; N. Amer. informal rat out, finger, drop a/the dime on; Austral. informal pimp on, pool, put someone's pot on.
→ stab
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stab someone in the back phrase
to do something bad that is not loyal to someone who trusts you
When I was in trouble, all my friends stabbed me in the back.
Thesaurus: to be cruel or unkind to someonesynonym
Main entry: stab
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betray someone
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Main Entry: ↑back
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stab (someone) in the back
: to hurt (someone who trusts you) by not giving help or by doing something morally wrong : to betray (someone)
He's the kind of person who gets you to trust him but then stabs you in the back.
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Main Entry: ↑stab
Useful english dictionary. 2012.