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WordReference Random House Learner's Dictionary of American English © 2024jack•knife /ˈdʒækˌnaɪf/USA pronunciation n., pl. -knives, v., -knifed, -knif•ing. n. [countable] - a large pocketknife.
- Sporta dive in which the diver bends in midair to touch the toes, keeping the legs straight, and then straightens out.
v. - Transport(of a trailer truck) to have the cab and trailer swivel at the point where they meet until they form aVshape: [no object]A tractor trailer truck had jackknifed and rolled over.[~ + object]The trailer was jackknifed across all four lanes of traffic.
- Sport (in diving) to perform a jackknife:[no object]The diver jackknifed cleanly into the water.
WordReference Random House Unabridged Dictionary of American English © 2024jack•knife ( jak′nīf′),USA pronunciation n., pl. -knives, v., -knifed, -knif•ing, adj. n. - a large pocketknife.
- Sport[Fancy Diving.]a dive in which the diver bends in midair to touch the toes, keeping the legs straight, and then straightens out.
v.i. - to bend or double over like a jackknife:The prizefighter jackknifed and fell when he was hit in the stomach.
- Transport(of a trailer truck) to have the cab and trailer swivel at the linkage until they form aVshape, as the result of an abrupt stop or accident.
- Sport(in diving) to perform a jackknife.
- to move rapidly at an abrupt angle.
v.t. - to cause to jackknife:The blow jackknifed the prizefighter.
- to cut with a jackknife.
adj. - resembling a jackknife, as in its shape, function, or manner of opening and folding.
- jack1 (compare jockteleg) + knife 1705–15, American.
Collins Concise English Dictionary © HarperCollins Publishers:: jackknife /ˈdʒækˌnaɪf/ n ( pl -knives)- a knife with the blade pivoted to fold into a recess in the handle
- a former name for a type of dive in which the diver bends at the waist in midair, with his legs straight and his hands touching his feet, finally straightening out and entering the water headfirst: forward pike dive
vb (intransitive)- (of an articulated lorry) to go out of control in such a way that the trailer swings round at an angle to the cab
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