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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.
like ˈcrazy/ˈmad(informal) very fast, hard, etc: running/working like crazy
See like crazy
1. Wildly; impetuously: drove like mad.
2. To an intense degree or great extent: worked like mad; snowing like mad.