We found 3 definitions of jackknifing from 2 different sources.
NounPlural: jackknives |
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jackknife - a dive in which the diver bends to touch the ankles before straightening out | ||
diving, dive an athletic competition that involves diving into water | ||
jackknife - a large knife with one or more folding blades | ||
clasp knife | ||
Verb |
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jackknife - dive into the water bending the body at the waist at a right angle, like a jackknife | ||
dive swim under water; "the children enjoyed diving and looking for shells" | ||
athletics, sport participation in sports events as an extracurricular activity |