intransitive. To be overcome with anger, madness, or distress; to lose control of one's senses; to rave.

to tear (out) the hair in a frenzy of grief or anger: now a hyperbolical expression.

to run (also occasionally go) amok. To run about in a violent or murderous frenzy; to go on a killing spree or a destructive rampage.

intransitive. To run amok, to rampage.

A wild Norse warrior of great strength and ferocious courage, who fought on the battle-field with a frenzied fury known as the ‘berserker rage’…

colloquial. Chiefly British. to do one's (occasionally the) nut: to become extremely angry, irritated, or agitated.

to go bush, to go into the country; to leave the city; to disappear from one's usual surroundings. Also transferred, to run wild, to go berserk…