“Jackknife” can mean a folding knife with a blade that folds into the handle. It can also mean a sudden movement where something bends or folds sharply, like a trailer jackknifing on the road.
In everyday English, people usually use “jackknife” when talking about a folding pocket knife or a vehicle accident where a truck and trailer fold into a sharp angle. The word can also be used as a verb, like “The truck jackknifed on the highway.”
Meaning & Usage
As a noun, “jackknife” often refers to a type of folding knife. As a verb, it describes a sharp folding motion, especially in driving or sports. The meaning depends on the situation, but it usually involves something bending suddenly.
Examples
“He kept a jackknife in his pocket.”
“The truck jackknifed after skidding on the wet road.”
What is a jackknife in driving?
In driving, a jackknife happens when a truck and trailer fold at an angle, often after braking too hard or losing control.
Is a jackknife the same as a pocketknife?
Not exactly. A jackknife is a type of pocketknife, usually with a folding blade.
Can jackknife be used as a verb?
Yes. People say a vehicle “jackknifed” when it bent sharply out of line, especially in an accident.
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