behind someone's back


Prepositional phraseEdit

behind someone's back

  1. (idiomatic) Without somebody's knowledge; secretly.
    The employees talked about their boss behind his back.
    • 1908, W. B. M. Ferguson, Zollenstein, chapterII:
      I had never defrauded a man of a farthing, nor called him knave behind his back. But now the last rag that covered my nakedness had been torn from me. I was branded a blackleg, card-sharper, and murderer.


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