n., adj., & v.
n. 1 a a horse for ordinary riding. b a horse let out for hire. c = JADE(2) 1. 2 a dull, uninspired writer. 3 a person hired to do dull routine work. 4 US a taxi.
attrib.adj. 1 used as a hack. 2 typical of a hack; commonplace (hack work).
v. 1 a intr. ride on horseback on a road at an ordinary pace. b tr. ride (a horse) in this way. 2 tr. make common or trite.
[ abbr. of HACKNEY ]