Definition of "nock"
- noun
- Either of the two grooves in a bow that hold the bowstring. 
- The notch at the rear of an arrow that fits on the bowstring. 
- Common misspelling of knock. 
- verb
- To fit an arrow against the bowstring of a bow or crossbow. 
- To cut a nock in (usually in an arrow's base or the tips of a bow). 
- Sources