The Collaborative International Dictionary of English v.0.48:

Hackney \Hack"ney\, v. t. [imp. & p. p. Hackneyed (-n[i^]d);
   p. pr. & vb. n. Hackneying.]
   1. 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.
      [1913 Webster]

            Had I so lavish of my presence been,
            So common-hackneyed in the eyes of men. --Shak.
      [1913 Webster]

   2. To carry in a hackney coach. --Cowper.
      [1913 Webster]

WordNet (r) 3.0 (2006):

hackneyed
    adj 1: repeated too often; overfamiliar through overuse;
           "bromidic sermons"; "his remarks were trite and
           commonplace"; "hackneyed phrases"; "a stock answer";
           "repeating threadbare jokes"; "parroting some timeworn
           axiom"; "the trite metaphor `hard as nails'" [syn:
           banal, commonplace, hackneyed, old-hat,
           shopworn, stock(a), threadbare, timeworn,
           tired, trite, well-worn]

Moby Thesaurus II by Grady Ward, 1.0:

72 Moby Thesaurus words for "hackneyed":
   antediluvian, antiquated, archaic, automatic, back-number, banal,
   bathetic, beaten, bewhiskered, bromidic, cliched, common,
   commonly known, commonplace, constant, conventional, corny,
   current, cut-and-dried, everyday, fade, familiar, frequent, fusty,
   habitual, hack, hackney, household, moth-eaten, musty, notorious,
   obsolete, old hat, out-of-date, outmoded, overworked, persistent,
   platitudinous, proverbial, public, quotidian, recurrent, recurring,
   regular, repetitive, routine, set, square, stale, stereotyped,
   stock, talked-about, talked-of, threadbare, timeworn, tired, trite,
   truistic, universally admitted, universally recognized, unoriginal,
   warmed-over, well-kenned, well-known, well-recognized,
   well-trodden, well-understood, well-worn, widely known, worn,
   worn thin, worn-out