to attack someone (especially verbally) unfairly in a deceitful, underhand, or treacherous manner, especially when they're not present in the place or situation that it happens. (as if stabbing them in the back). See backbite.
To punish or otherwise express extreme anger at, especially as a scapegoat or target of outrage.
To execute (a person) by nailing to a cross.
To thoroughly beat at a sport or game.