backstabber

Definitions

noun A traitor or hypocrite, such as a co-worker or friend assumed trustworthy but who figuratively attacks when one's back is turned.

From back + stab + -er

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Not being a backstabber is a good start, but not enough after the Straight Talk Trainwreck.

A friendly suggestion to former McCain campaign staffers. - Moe_Lane’s blog - RedState 2009
If the backstabber is your boss, demand you create "clarification procedures" for fixing the problem that are put on record somewhere.

Karen Salmansohn: Protect Yourself From Backstabbers! 2008
If the backstabber is a colleague, not only confront the offender, but request a private meeting with your boss -- and show them the offending "knife evidence" in a calm, rational way.

Karen Salmansohn: Protect Yourself From Backstabbers! 2008
As for the so-called backstabber, I didn't really like or dislike him one way or the other, I still don't.

elfpvke Diary Entry elfpvke 2004
Its interesting how many people consider him a "backstabber".

WordPress.com News 2009
Specter - Just another "backstabber" and just loyal to himself

WordPress.com News 2009
A person can only be a "backstabber" when the person he's supposedly backstabbing has no idea that he speaks that way about her.

It's true! It's true! Marcelle 2009
Helen, what should we call Lieberman besides a "backstabber"?

WordPress.com News 2008
Helen, what should we call Lieberman besides a "backstabber"?

WordPress.com News 2008
"Singh, who had repeatedly accused the Congress leader of calling SP chief Mulayam Singh Yadav a" backstabber ", said.

The Times of India 2009