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