Source : Webster's Revised Unabridged Dictionary (1913)

Clasp \Clasp\, n.
   1. An adjustable catch, bent plate, or hook, for holding
      together two objects or the parts of anything, as the ends
      of a belt, the covers of a book, etc.

   2. A close embrace; a throwing of the arms around; a
      grasping, as with the hand.

   {Clasp knife}, a large knife, the blade of which folds or
      shuts into the handle.

   {Clasp lock}, a lock which closes or secures itself by means
      of a spring.

Source : WordNet®

clasp knife
     n : a large knife with one or more folding blades [syn: {jackknife}]