like mad

Từ điển Oxford Advanced Learner 8th

▪ I. like ˈcrazy/ˈmad idiom
(informal)very fast, hard, much, etc
• We worked like crazy to get it done on time.
Main entry: ↑crazy_idiom
 
▪ II. like ˈcrazy/ˈmad idiom
(informal)very fast, hard, much, etc
•I had to run like mad to catch the bus.
Main entry: ↑mad_idiom