Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Language: Old Norse
Origin: berserkr 'wild fighter', from björn 'bear' + serkr 'shirt'

berserk

 adjective
     
ber‧serk

go berserk

informal to become very angry and violent:
Dad went berserk when he found out.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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