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From The Collaborative International Dictionary of English v.0.48:
Knap \Knap\, 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]