berserk
adjective [not usually before noun] (informal)very angry, often in a violent way or without control 盛怒；暴跳如雷 very excited 极为激动；兴奋不已；发狂
Word Originearly 19th cent. (originally as a noun denoting a wild Norse warrior who fought with frenzy): from Old Norse berserkr (noun), probably from birn-, bjorn + serkr ‘coat’, but also possibly from berr ‘bare’ (i.e. without armour).