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Noun: backstabber  'bak,sta-bu(r)
  1. A traitor; someone who betrays you behind your back
    "He discovered that his colleague was a backstabber who had been undermining his work";
    - back-stabber

Derived forms: backstabbers, back-stabbers

Type of: betrayer, double-crosser, double-dealer, traitor, two-timer

Encyclopedia: Backstabber