Hypertext Webster Gateway: "jackknife"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Jackknife \Jack"knife`\, n.
A large, strong clasp knife for the pocket; a pocket knife.
From WordNet (r) 1.7 (wn)
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
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