Do a roaring business - Idioms by The Free Dictionary
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do a roaring trade
To sell something very successfully. It's been so hot lately that we've done a roaring trade in selling cold drinks.
do a roaring trade (or business) sell large amounts of something; do very good business. informal
do a roaring ˈtrade (in something) (informal) sell something very quickly or do a lot of business: Toy stores do a roaring trade at this time of year.