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Phrase(s): stab someone in the back
1. Lit. to thrust a knife into someone’s back. • Max planned to stab his hostage in the back if he screamed. • The murderer stabbed his victim in the back and fled. 2. Fig. to betray someone. • I wish you would not gossip about me. There is no need to stab me in the back.
McGrawhill's American Idioms And Phrasal Verbs