jack knife - meaning and definition. What is jack knife
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What (who) is jack knife - definition

WIKIMEDIA DISAMBIGUATION PAGE
Jack-knife; Jack knife; Jackknife (disambiguation)

jack-knife         
also jackknife (jack-knifes, jack-knifing, jack-knifed)
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 three lanes of the opposite carriageway.
VERB: V
jackknife         
Jackknife         
·noun A large, strong clasp knife for the pocket; a pocket knife.

Wikipedia

Jackknife

Jackknife may refer to:

  • Pocket knife or jackknife, a compact, foldable knife
  • Jackknife Bar, Portland, Oregon, U.S.
  • Jackknifing, a type of crash with articulated vehicle combinations
Examples of use of jack knife
1. In the 40s no boy over the age of five would be worth his salt if he didn‘t carry a knife, usually a Jack knife with a thing for getting stones out of horses hooves. – Jimpy, Lincs.