be out for blood(redirected from is out for blood)
be out for blood
To seek vengeance in an especially hostile or belligerent manner. This phrase is often used hyperbolically, although it can refer to physical violence. Primarily heard in US. I'd avoid the boss if I were you—he's out for blood and screaming at everyone he sees. Some neighborhood kids beat me up last night, and now my brother is out for blood.