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go gangbustersproceed very vigorously or successfully. North American informal
Literally, a gangbuster is ‘a person who assists in the vigorous or violent break-up of criminal gangs’, from which the more general sense of ‘a successful person’ has developed. The phrase like gangbusters means ‘vigorously and successfully’.
1994 Wall Street Journal Sotheby's glamorous semi-annual black tie auction of contemporary art was going gangbusters.
See also: gangbuster