Definition of gangbusters noun from the Oxford Advanced Learner's Dictionary

 

gangbusters

 noun
noun
BrE BrE//ˈɡæŋbʌstəz//
 
; NAmE NAmE//ˈɡæŋbʌstərz//
 
 
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Idioms
like gangbusters
 
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(North American English, informal) with a lot of energy and enthusiasm We went like gangbusters to get the project done on time.
See the Oxford Advanced American Dictionary entry: gangbusters