jackknife
noun
1 jackknife
A large knife with one or more folding blades.
synonym: clasp knife.
Dutch: knipmes, zakmes
Polish: scyzoryk
2 jackknife
A dive in which the diver bends to touch the ankles before straightening out.
verb
1 jackknife
Dive into the water bending the body at the waist at a right angle, like a jackknife.
Moby thesaurus: adz, ax, belly buster, belly flop, belly whopper, bread knife, bushwhacker, butcher knife, cannonball, carving knife, chaser, chisel, cleaver, clipper, clippers, crash dive, dagger, dive, drop, fall ... show more.
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