or pretty horsebreaker, subs. (colloquial).A woman (c. 1860), hired to ride in the park; hence, a riding courtesan. See also quot. 1864. For synonyms, see BARRACK-HACK and TART.
1864. YATES, Broken to Harness, ch. iv., p. 33 (1873). Kate Mellon was a HORSEBREAKER, a bonâ-fide horsebreaker; one who curbed colts, and took it out of kickers and rearers.
1865. Public Opinion, 30 Sept. These demi-monde people, anonymas, HORSE-BREAKERS, hetairæ are by degrees pushing their way into society.