berserk

[ber-surk, -zurk]
adjective
1.
violently or destructively frenzied; wild; crazed; deranged: He suddenly went berserk.
noun
2.
(sometimes initial capital letter) Scandinavian Legend.. Also, berserker. an ancient Norse warrior who fought with frenzied rage in battle, possibly induced by eating hallucinogenic mushrooms.

Origin:
1865–70; < Old Norse berserkr, equivalent to ber- (either *ber-, base of bjǫrn bear2 or berr bare1) + serkr sark, shirt, armor

berserkly, adverb
berserkness, noun


1. violent, mad, maniacal, rabid, demented, lunatic.


1. rational, calm.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
berserk (bəˈzɜːk, -ˈsɜːk)
 
adj
1.  frenziedly violent or destructive (esp in the phrase go berserk)
 
n
2.  Also called: berserker a member of a class of ancient Norse warriors who worked themselves into a frenzy before battle and fought with insane fury and courage
 
[C19: Icelandic berserkr, from björn bear + serkr shirt]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

berserk
"Norse warrior," 1822, introduced by Sir Walter Scott, from O.N. berserkr (n.) "raging warrior of superhuman strength," probably from *ber- "bear" + serkr "shirt," thus lit. "a warrior clothed in bearskin." The -r was O.N. masc. singular ending, mistaken for agent noun suffix. The adj. is 1867, from
such phrases as go berserk.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Instantly, the concert goers went berserk.
We're all familiar with new email users who go berserk and swamp us with
  interminably long and chatty messages.
Many of the smartest, most patriotic Americans have gone berserk over this new
  budget.
Some of the Armageddon-like coverage encouraged fans to go berserk.
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