Source : Webster's Revised Unabridged Dictionary (1913)

Knag \Knag\, n. [Cf. Prov. G. knagge a knot in wood, Sw. knagg,
   Dan. knag a hook to hand clothes on, a bracket; Gael. & Ir.
   cnag peg, knob.]
   1. A knot in wood; a protuberance. --Wright.

   2. A wooden peg for hanging things on. --Wright.

   3. The prong of an antler. --Holland.

   4. The rugged top of a hill. [Prov. Eng.] --Halliwell.