noun an ostentatiously or expensively accoutred man. The character of Flash Harry created by George Cole (b.1925) in the St Trinians films (mid-1950s–mid-60s) is, perhaps, the most widely known popular usage – adding a shading of criminality to the meaning; Sir Malcolm Sargent (1895–1967), a conductor noted for his elegance and showmanship, is remembered by the nickname Flash Harry UK, 1964