Entry 3 senses · 2 variants Webster, 1913 Nock /näk/ · IPA /nɒk/ n. v. t. 01 n. A notch. 1. A notch. “He took his arrow by the nock.” — Chapman. 2. The upper fore corner of a boom sail or of a trysail.(Naut.) 02 v. t. To notch; to fit to the string, as an arrow; to string, as a bow. 1. To notch; to fit to the string, as an arrow; to string, as a bow.