| jackknife | | |
| n. (artifact) | 1. clasp knife, jackknife | a large knife with one or more folding blades. |
| ~ pocket knife, pocketknife | a knife with a blade that folds into the handle; suitable for carrying in the pocket. |
| n. (act) | 2. jackknife | a dive in which the diver bends to touch the ankles before straightening out. |
| ~ dive, diving | a headlong plunge into water. |
| v. (motion) | 3. jackknife | dive into the water bending the body at the waist at a right angle, like a jackknife. |
| ~ athletics, sport | an active diversion requiring physical exertion and competition. |
| ~ dive | plunge into water.; "I was afraid to dive from the board into the pool" |
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