stab in the back
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Related to stab in the back: stab someone in the back
a stab in the back
A betrayal; an act of treachery. It felt like a stab in the back to hear that Paul was going out with my ex-girlfriend. The campaign coordinator's mid-race shift of allegiance will be quite a stab in the back for the incumbent president.
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.
stab (someone) in the back
To harm (someone) by treachery or betrayal of trust.