\Nock\, n. [See {Notch}.]
1. A notch.
         He took his arrow by the nock.        --Chapman.
2. (Naut.) The upper fore corner of a boom sail or of a
   trysail.

\Nock\, v. t.
To notch; to fit to the string, as an arrow; to string, as a
bow. --Chapman.