To be extremely or triumphantly successful. For having such a limited budget, their play turned out to be a roaring success.My business was a roaring success in the 1980s and '90s, but the advent of the Internet rendered my services obsolete.I'm worried we're going to lose funding if our research project isn't a roaring success.
(informal) a very great success: The band was such a roaring success that they have been asked to stay for an extra week. ♢ His movies haven’t exactly been a roaring success, have they?
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