Definitions
1.nounEither of the two grooves in a bow that hold the bowstring.
2.nounThe notch at the rear of an arrow that fits on the bowstring.
3.nounThe upper fore corner of a boom sail or trysail.
4.verbTo fit an arrow against the bowstring of a bow or crossbow. (See also notch.)
5.verbTo cut a nock in (usually in an arrow's base or the tips of a bow).