roaring (adj.)youdaoicibaDictYouDict[roaring 词源字典]
late 14c., present participle adjective from roar (v.). Used of periods of years characterized by noisy revelry, especially roaring twenties (1930); but also, in Britain, roaring fifties (1892). Roaring forties in reference to exceptional rough seas between latitudes 40 and 50 south, is attested from 1841.[roaring etymology, roaring origin, 英语词源]