a horse for riding or driving; a nag; a pony.-a horse or pony kept for hire.-a carriage kept for hire; a hack; a hackney coach.-a hired drudge; a hireling; a prostitute.-let out for hire; devoted to common use; hence, much used; trite; mean; as, hackney coaches; hackney authors.-to devote to common or frequent use, as a horse or carriage; to wear out in common service; to make trite or commonplace; as, a hackneyed metaphor or quotation.-to carry in a hackney coach.