Definition of berserk adjective from the Oxford Advanced Learner's Dictionary

     

    berserk

     adjective
    adjective
    BrE BrE//bəˈzɜːk//
     
    ; NAmE NAmE//bərˈzɜːrk//
     
    ; BrE BrE//ˈsɜːk//
     
    ; NAmE NAmE//bərˈsɜːrk//
     
    [not usually before noun](informal) Excitement, Anger
     
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  1. 1very angry, often in a violent or uncontrolled way He went berserk when he found out where I'd been. See related entries: Anger
  2. 2very excited People were going berserk with excitement. See related entries: Excitement
  3. Word Origin 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 + serkr ‘coat’, but also possibly from berr ‘bare’ (i.e. without armour).
See the Oxford Advanced American Dictionary entry: berserk