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like mad is an adverb meaning "(informal) with great speed or effort or intensity; used for emphasis". It carries one recorded sense.
(informal) with great speed or effort or intensity; used for emphasis
“drove like crazy”
“worked like hell to get the job done”
“this sprain hurts like hell”
“ran like sin for the storm cellar”
“work like thunder”
“fought like the devil”
colloquialism
Definitions, synonyms and semantic relations for like mad come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.