DICT.TW Dictionary Taiwan

 jack·knife /ˈʤækˌnaɪf/
 大折合式刀,鐮刀式跳水(vi.)彎身(vt.)用大折刀切

 Jack·knife n. A large, strong clasp knife for the pocket; a pocket knife.
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 jackknife
      n 1: a large knife with one or more folding blades [syn: clasp
           knife]
      2: a dive in which the diver bends to touch the ankles before
         straightening out
      v : dive into the water bending the body at the waist at a right
          angle, like a jackknife
      [also: jackknives (pl)]