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1. a lot like crazy The competition is growing like mad in this field.
2. very quickly like crazy My poor heart is beating like mad.
if something hurts like mad it hurts very much, and if you do something like mad you do it very quickly and with a lot of force This cut stings like mad. I braked like mad but couldn't stop in time and hit the car in front.
See like crazy
1. Wildly; impetuously: drove like mad.
2. To an intense degree or great extent: worked like mad; snowing like mad.