[f. FLAT sb. + MAN.] One who navigates a flat. See FLAT sb.3 9 a.
1883. Manch. Guardian, 12 Oct., 5/2. Two flatmen have been … charged with attempting to murder a woman.
1884. L’pool Merc., 14 Feb., 5/10. About 350 flatmen employed on the flats of the Bridgwater Navigation Company.
