simple past tense and past participle of knap

A protuberance; a swelling; a knob. / The crest of a hill / A small hill

A sharp blow or slap.

(transitive) To shape a brittle material having conchoidal fracture, usually a mineral (flint, obsidian, chert etc.), by breaking away flakes, often forming a sharp edge or point.

present participle of knap

Third-person singular simple present indicative form of knap