1. A sharp blow or slap.

Noun (etymology 2)

(chiefly dialect)
  1. A protuberance; a swelling; a knob.
  2. The crest of a hill
  3. A small hill


  1. To shape a vitreous mineral (flint, obsidian, chert etc.) by breaking away flakes, often forming a sharp edge or point.
  2. To rap or strike sharply.
  3. To bite; to bite off; to break short.
  4. To make a sound of snapping.

The above text is a snippet from Wiktionary: knap
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