jack-knife

jack-knife
1. noun

He kept a jack-knife in his pocket for various tasks.

b) The front-dive pike, in which the body folds and unfolds.

It took me hundreds of dives to master even the simple jackknife

2. verb
a) To fold in the middle, as a jackknife does.

The cat jackknifed in the air and landed gracefully on its feet.

b) To cause a semi-trailer truck to fold like a jackknife in a traffic accident.

Before I knew what was happening, Id jack-knifed the rig like nobodys business. <!transitive


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  • jack-knife — jack knife1 plural jack knives n 1.) a knife with a blade that folds into its handle 2.) a ↑dive in which you bend at the waist when you are in the air jack knife 2 jack knife2 v [I] if a large vehicle with two parts jack knifes, it slides out of …   Dictionary of contemporary English

  • jack|knife — «JAK NYF», noun, plural knives, verb, knifed, knif|ing, adjective. –n. 1. a large, strong pocketknife. 2. a kind of dive in which the diver, keeping his knees straight, touches his feet with hi hands in midair and straightens out before entering… …   Useful english dictionary

  • jack-knife — {{11}}jack knife (n.) also jackknife, large pocket knife, 1711, probably Amer.Eng., perh[aps] associated with some sense of JACK sb.1, but Cf. jackleg knife [OED]; see JACK (Cf. jack) + KNIFE (Cf. knife) (n.). Jackleg was a U.S. colloquial term… …   Etymology dictionary

  • jack-knife — jack knifes, jack knifing, jack knifed VERB If a truck that is in two parts jack knifes, the back part swings around at a sharp angle to the front part in an uncontrolled way as the truck is moving. His vehicle jack knifed, and crashed across all …   English dictionary

  • jack knife — knife which folds into the handle …   English contemporary dictionary

  • Jack-Knife Gypsy — Infobox Album | Name = Jack Knife Gypsy Type = Album Artist = Paul Siebel Released = June, 1971 Recorded = 1971 Genre = Country rock/Folk rock Length = 37:44 Label = Elektra (42076), Line (900951) Producer = Robert W. Zachary Reviews = *Allmusic… …   Wikipedia

  • jack-knife — 1 noun plural jack knives, (C) 1 a knife with a blade that folds into its handle 2 a dive 2 (1) in which you bend at the waist when you are in the air 2 verb jack knifing, jack knifed (I) if a large vehicle with two parts jack knifes, the back… …   Longman dictionary of contemporary English

  • jack knife — The action of a vehicle (tractor) with a trailer in which the trailer and the vehicle form a V instead of normally being pulled in a straight line. Usually this is the result of a skid in which the trailer swings around dangerously and tries to… …   Dictionary of automotive terms

  • jack-knife — …   Useful english dictionary

  • The Jack-Knife Man — Infobox Film name = The Jack Knife Man image size = caption = director = King Vidor producer = King Vidor writer = Ellis Parker Butler William Parker narrator = starring = F. A. Turner music = cinematography = Ira H. Morgan editing = distributor …   Wikipedia

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