n. [ AS. cnæp, cnæpp, top, knob, button; cf. Icel. knappr knob, Sw. knapp, Dan. knap button, W., Gael., & Ir. cnap knob, button, and E. knop. ] A protuberance; a swelling; a knob; a button; hence, rising ground; a summit. See Knob, and Knop. [ 1913 Webster ]

The highest part and knap of the same island. Holland. [ 1913 Webster ]

v. t. [ imp. & p. p. Knapped p. pr. & vb. n. Knapping. ] [ D. knappen to chew, bite, crack, take hold of; prob. of imitative origin. ] 1. To bite; to bite off; to break short. [ Obs. or Prov. Eng. ] [ 1913 Webster ]

He will knap the spears apieces with his teeth. Dr. H. More. [ 1913 Webster ]

He breaketh the bow, and knappeth the spear in sunder. Ps. xlvi. 9 (Book of Common Prayer.) [ 1913 Webster ]

2. To strike smartly; to rap; to snap. [ Chiefly Brit. ] Bacon. [ 1913 Webster ]

v. i. To make a sound of snapping. Wiseman. [ 1913 Webster ]

n. A sharp blow or slap. Halliwell. [ 1913 Webster ]

n. (Bot.) The bladder campion (Silene inflata). [ 1913 Webster ]

a. [ See Knap to strike. ] Snappish; peevish. [ Obs. ] Grafton. [ 1913 Webster ]

v. i. [ Freq. of knap, v., cf. D. knabbelen to gnaw. ] To break off with an abrupt, sharp noise; to bite; to nibble. [ Obs. or Prov. Eng. ] [ 1913 Webster ]

a. Having knaps; full of protuberances or humps; knobby. [ Obs. ] Huloet. [ 1913 Webster ]

n. [ D. knapzak; knappen to eat + zak a bag. See Knap, v. t., and Sack. ] A case of canvas, leather, nylon, or other sturdy fabric, fitted with straps, for carrying on the back the food, clothing, or other supplies for a soldier or a traveler; as, to hike up the mountain with lunch in a knapsack. [ 1913 Webster +PJC ]

And each one fills his knapsack or his scrip
With some rare thing that on the field is found. Drayton. [ 1913 Webster ]

n. (Bot.) The black centaury (Centaurea nigra); -- so called from the knoblike heads of flowers. Called also bullweed. [ 1913 Webster ]