Definition from Wiktionary, the free dictionary
berserk (plural berserks)
a crazed Norse warrior who fought in a frenzy
- Injuriously, maniacally, or furiously violent or out of control.
- After he watched his sister stabbed to death, he went berserk and attacked the killer like a beast or a wild animal.
injuriously, maniacally, or furiously violent or out of control