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.