behind someone's back


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behind someone's back

Out of one's presence or without someone's knowledge, as in Joan has a nasty way of maligning her friends behind their backs. Sir Thomas Malory used this metaphoric term in Le Morte d'Arthur (c. 1470): "To say of me wrong or shame behind my back." [Early 1300s]
See also: back, behind

behind someone's back

without a person's knowledge and in an unfair or dishonourable way.
See also: back, behind
References in periodicals archive ?
You are an honest person and going behind someone's back is the worst thing you could have done.
It would be different if it was a fistfight but when you go behind someone's back and slash them with a knife - the scumbag needs to rot in hell.
Do I ever tell my child that I don't like her unless she does what I want, or Do I think that talking badly behind someone's back or publicly teasing someone about their flaws is unacceptable, or Do I think that this is not really serious and does not really hurt anyone?
He said: "Jackie is straight down the middle, he wouldn't do anything behind someone's back.
It can help when you need to brag or blow off steam or tell a secret or even talk behind someone's back.