<p><strong>Noun:</strong></p><ul><li>A metal or plastic piece at the end of an arrow, having a notch for the bowstring.</li><li>A notch or groove at the end of an arrow into which the bowstring fits.</li><li>A notch or groove at each end of a bow, to hold the bowstring in place.</li><li>Nautical: throat (def 6a).</li></ul><p><strong>Verb:</strong></p><ul><li>(used with object) to furnish with a nock.</li><li>To adjust (the arrow) to the bowstring, in readiness to shoot.</li></ul>