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With great intensity or speed. These mosquito bites are itching like mad! Now that there's the threat of a snowstorm, shoppers have been buying shovels and salt like mad.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
like ˈcrazy/ˈmad(informal) very fast, hard, etc: running/working like crazy
Farlex Partner Idioms Dictionary © Farlex 2017
See like crazy
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
1. Wildly; impetuously: drove like mad.
2. To an intense degree or great extent: worked like mad; snowing like mad.
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.