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2. An informal expression indicating being extremely excited or enthusiastic about something: The crowd went berserk when the movie star finally appeared.
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3. Destructively or frenetically violent: The berserk worker started to smash all of the windows.
4. Mentally or emotionally deranged and greatly disturbed: Irene was berserk with grief when her son stumbled and fell down the stairs.
5. Informal: Unrestrained, as with enthusiasm or appetite; wild: The children went berserk over the chocolates.
When people informally say, "the group went berserk", they probably don't realize how extreme such a remark really is.
The adjective comes from the noun berserker, or berserk, which is from the Old Norse word berserkr, “a wild warrior or champion”. Such warriors wore hides of bears, which explains the probable origin of berserkr as a compound of bera, “bear” and serkr, “shirt, coat”.
These berserkers became frenzied in battle, howling like animals, foaming at the mouth, and biting the edges of their iron shields.
The term berserker was first recorded in English in the early 19th century, long after these wild warriors ceased to exist.