1. A large knife with one or more folding blades
   - clasp knife 
2. A dive in which the diver bends to touch the ankles before straightening out

1. Dive into the water bending the body at the waist at a right angle, like a jackknife

Derived forms: jackknives, jackknifes, jackknifing, jackknifed

Type of: dive, diving, pocket knife, pocketknife

Encyclopedia: Jackknife

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