backstabber

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backstabber

One who attacks or betrays someone in a deceitful, underhanded, or treacherous way. He proved to be a backstabber in business, assaulting the character of his competition to get ahead in the game. I thought Mary was my friend, but then she said those mean things behind my back. She turned out to be nothing but a backstabber.
References in periodicals archive ?
While conducting our research into BackStab attacks, we gathered over 600 malware samples from 30 countries around the world that were used to conduct remote BackStab attacks.
The former Vice-President chose to backstab a friend for his own personal gain.
Despite private assurances that he would not endorse any of the Democratic Presidential candidates until the primaries had produced a nominee; Gore evidently decided it was in his own best interest to backstab the loyal Lieberman by endorsing Governor Howard Dean of Vermont.
They think the best way to survive is to sabotage and backstab their opponents.
As temporary as some BFFs turn out to be, it might make sense to create some new acronyms: BFRN (Best Friend Right Now) or BFUSBY (Best Friend Until She Backstabs You).