a knife in the back(redirected from knife in the back)
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a knife in the back
A grievous or supreme act of treachery or betrayal. (Usually preceding "of/for (someone).") This revelation regarding the governor's longstanding misappropriation of public funds is sure to be a knife in the back of his constituency, as well as every taxpayer in the state.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.