<p><strong>Verb</strong></p><ul><li>(used without object) to listen attentively; hearken.</li><li>(used with object) Archaic: to listen to; hear.</li></ul><p><strong>Noun</strong></p><ul><li>a hunter's shout to hounds, as to encourage them in following the scent.</li></ul><p><strong>Verb Phrase</strong></p><ul><li>(of hounds) to return along the course in order to regain a lost scent.</li><li>to return to a previous subject or point; revert: He kept harking back to his early days in vaudeville.</li></ul>