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 ?
He'd be pleased to know his family continues to bitch and backstab.
They think the best way to survive is to sabotage and backstab their opponents.
Hamad backstabs his father" highlights that Sheikh Khalifa was growing suspicious of his children that he kept them constantly under surveillance.
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).