[1] : The Collaborative International Dictionary of English v.0.48

hark \hark\ haumrk, v. i. oe. herken. see hearken.
   to listen; to hearken. now rare, except in the imperative
   form used as an interjection, hark listen. --hudibras.
   1913 webster

   hark away hark back hark forward sporting, cries
      used to incite and guide hounds in hunting.

   to hark back, to go back for a fresh start, as when one has
      wandered from his direct course, or made a digression.
      1913 webster

            he must have overshot the mark, and must hark back.
                                                  --haggard.
      1913 webster

            he harked back to the subject.        --w. e.
                                                  norris.
      1913 webster
see also:
hearken hark away hark back hark forward to hark back 

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