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backstab

[bak-stab]
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verb (used with object), back·stabbed, back·stab·bing.
  1. to attempt to discredit (a person) by underhanded means, as innuendo, accusation, or the like.

Origin of backstab

First recorded in 1920–25; back2 + stab
Related formsback·stab·ber, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for backstabber

n.

also back-stabber, in the figurative sens, 1839, from back (n.) + agent noun from stab (v.). The verb backstab in the figurative sense is from 1925.

Online Etymology Dictionary, © 2010 Douglas Harper