Ⅰ.
► to sell a lot of something: »
We do a roaring trade in ice-creams during the hot weather.
Main Entry: ↑trade
Ⅱ.
do a roaring trade
► INFORMAL to sell a lot of goods very quickly: »
The shop opened last September and has been doing a roaring trade since then.
Main Entry: ↑roaring
Financial and business terms. 2012.