- After the match a section of the spectators went berserk and pandemonium raged.
- A drunken holidaymaker who went berserk on a plane during a fit of air rage was today beginning a two-year jail sentence.
- They went berserk, insane when the prices fell.
early 19th century (originally as a noun denoting an ancient Norse warrior who fought with wild or uncontrolled ferocity): from Old Norse berserkr (noun), probably from birn-, bjorn (see bear2) + serkr 'coat', but also possibly from berr 'bare' (i.e. without armour).