jackknife

Noun
  1. A large knife with one or more folding blades (synset 103042465)
    is a type of: pocket knife, pocketknife - a knife with a blade that folds into the handle; suitable for carrying in the pocket
    same as: clasp knife
  2. A dive in which the diver bends to touch the ankles before straightening out (synset 100445325)
    is a type of: dive, diving - a headlong plunge into water
Verb
  1. Dive into the water bending the body at the waist at a right angle, like a jackknife (synset 201967466)
    referred to in: athletics, sport - an active diversion requiring physical exertion and competition
    is a type of: dive - plunge into water

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