To attack (someone) unfairly, especially in an underhand, deceitful manner: "Some backstab each other and threaten to settle their differences with a punch” ( Thomas Boswell).
to attack somebody (especially verbally) unfairly in a deceitful, underhand, or treacherous manner, particularly when they truly are perhaps not present in the area or circumstance so it takes place. (like stabbing them in back). See backbite.
Definition for "backstab"
To attack (someone) unfairly, especially in an underhand,…