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1. (n.) jackknife
a large pocketknife.
2. jackknife
a dive in which the diver bends in midair to touch the toes, keeping the legs straight, and then straightens out.
3. (v.i.) jackknife
to bend over from or at the middle; double over like a jackknife.
4. jackknife
(of a trailer truck) to have the cab and trailer swivel at the linkage until they form a
5. jackknife
(in diving) to perform a jackknife.
6. (v.t.) jackknife
to cause to jackknife.
7. jackknife
to cut with a jackknife.
Etymology: (1705–15, Amer.)
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| Definition of 'jackknife' |
Princeton's WordNet |
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1. (noun) clasp knife, jackknife
a large knife with one or more folding blades
2. (verb) jackknife
a dive in which the diver bends to touch the ankles before straightening out
3. (verb) jackknife
dive into the water bending the body at the waist at a right angle, like a jackknife
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| Definition of 'jackknife' |
Webster Dictionary |
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1. (noun) jackknife
a large, strong clasp knife for the pocket; a pocket knife
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Definitions of jackknife 
