early 19th cent. (originally as a noun denoting a wild Norse warrior who fought with frenzy): from Old Norse berserkr(noun), probably from birn-, bjorn(see bear) + serkrcoat, but also possibly from berrbare (i.e. without armour)
英英釋義網絡釋義
noun
1.one of the ancient Norse warriors legendary for working themselves into a frenzy before a battle and fighting with reckless savagery and insane fury
2.in a murderous frenzy as if possessed by a demon;