Definition of knap

• n. - A protuberance; a swelling; a knob; a button; hence, rising ground; a summit. See Knob, and Knop.
• v. t. - To bite; to bite off; to break short.
• v. t. - To strike smartly; to rap; to snap.
• v. i. - To make a sound of snapping.
• n. - A sharp blow or slap.