I. noun Date: 1711 1. a large strong pocketknife 2. a dive executed headfirst in which the diver bends from the waist and touches the ankles while holding the knees unbent and then straightens out II. verb Date: 1806 transitive verb 1. to cut with a jackknife 2. to cause to double up like a jackknife intransitive verb 1. to double up like a jackknife <
jackknifed into a seat beside me, folding up his six feet eight — Lady Bird Johnson
2. to turn and form an angle of 90 degrees or less with each other — used especially of a tractor-trailer combination

New Collegiate Dictionary. 2001.

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  • Jackknife — may refer to:* Jackknife, pocket knife * Jacknife , 1989 American film * Jackknife, jackknife hold, a pinning move in wrestling * Jackknife, kicking move involving 540 degree rotation * Jackknife, resampling technique in statistics * Jackknife,… …   Wikipedia

  • jackknife — ☆ jackknife [jak′nīf΄ ] n. pl. jackknives [jak′nīvz΄] [ JACK + KNIFE] 1. a large pocketknife 2. a dive in which the diver keeps his knees unbent, touches his feet with his hands, and then straightens out just before plunging into the water vt.… …   English World dictionary

  • Jackknife — ist die englische Bezeichnung für ein Klappmesser. Davon abgeleitet bezeichnet es: Jackknife (Statistik), in der Statistik eine Methode des Resampling eine Variation der Wrestling Technik Powerbomb eine Variation der Kampfsport Technik 540 Kick… …   Deutsch Wikipedia

  • jackknife — ► NOUN (pl. jackknives) 1) a large knife with a folding blade. 2) a dive in which the body is bent at the waist and then straightened. ► VERB (jackknifed, jackknifing) 1) move (one s body) into a bent or doubled up position. 2) …   English terms dictionary

  • Jackknife — Jack knife , n. A large, strong clasp knife for the pocket; a pocket knife. [1913 Webster] …   The Collaborative International Dictionary of English

  • Jackknife — En statistiques, le jackknife ((en) couteau suisse) est une méthode de rééchantillonnage qui tire son nom de couteau suisse du fait qu elle peut être utile à diverses choses : réduction du biais en petit échantillon, construction d un… …   Wikipédia en Français

  • jackknife — /jak nuyf /, n., pl. jackknives, v., jackknifed, jackknifing, adj. n. 1. a large pocketknife. 2. 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. 3. to bend or… …   Universalium

  • jackknife — I UK [ˈdʒækˌnaɪf] / US noun [countable] Word forms jackknife : singular jackknife plural jackknives UK [ˈdʒækˌnaɪvz] / US 1) a small knife with a blade that folds into its handle 2) a dive in which you jump high, touch your toes, and then stretch …   English dictionary

  • jackknife — jack•knife [[t]ˈdʒækˌnaɪf[/t]] n. pl. knives, 1) a large pocketknife 2) spo a dive in which the diver bends in midair to touch the toes, keeping the legs straight, and then straightens out 3) cvb to bend over from or at the middle; double over… …   From formal English to slang

  • jackknife — /ˈdʒæknaɪf / (say jaknuyf) noun (plural jackknives) 1. a large knife with a blade that folds into the handle. 2. → jackknife dive. –verb (i) (jackknifed, jackknifing) 3. to bend or fold up, like a jackknife. 4. (of a horse) to buck bringing all… …  

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