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ber·serk(bər-sûrk′, -zûrk′, bə-)
1. Destructively or frenetically violent: a berserk worker who started smashing all the windows.
2. Mentally or emotionally upset; deranged: berserk with grief.
3. Informal Unrestrained, as with enthusiasm or appetite; wild: berserk over chocolates.
1. One that is violent, upset, or unrestrained.
2. A berserker.
[Back-formation from berserker.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
in a berserk or crazy manner
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014