From The Collaborative International Dictionary of English v.0.48 [gcide]:
Nock \Nock\, n. [See Notch.]
1. A notch.
[1913 Webster]
He took his arrow by the nock. --Chapman.
[1913 Webster]
2. (Naut.) The upper fore corner of a boom sail or of a
trysail.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Nock \Nock\, v. t.
To notch; to fit to the string, as an arrow; to string, as a
bow. --Chapman.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
nock
v 1: make small marks into the surface of; "score the clay
before firing it" [syn: score, nock, mark]