jackknife

v. bend like a pocketknife, double up, bend sharply in half; do a jackknife dive

n. large pocketknife whose blade folds into the handle; dive in which the diver doubles up in mid-air and then straightens out before entering the water

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Noun
1. a large knife with one or more folding blades
(synonym) clasp knife
(hypernym) pocketknife, pocket knife
2. a dive in which the diver bends to touch the ankles before straightening out
(hypernym) dive, diving

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Verb
1. dive into the water bending the body at the waist at a right angle, like a jackknife
(hypernym) dive
(classification) sport, athletics

v. vybočit

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