Definition of Jack-knefe

A compact folding knife.
He kept a jack-knife in his pocket for various tasks.
The front-dive pike, in which the body folds and unfolds.
It took me hundreds of dives to master even the simple jackknife
(colloquial) A semi-trailer truck accident in which the vehicle mimics the closing of a jack-knife.
I have seen several jack-knives along that dangerous stretch of road.
((physics) A statistical tool for error estimation, so called for its usefulness.
The jackknife provides a reasonably robust way to measure error propagation.
To fold in the middle, as a jackknife does.
The cat jackknifed in the air and landed gracefully on its feet.
(colloquial) To cause a semi-trailer truck to fold like a jackknife.
Before I knew what was happening, I'd jack-knifed the rig like nobody's business.
Before I knew what was happening, I'd jack-knifed like nobody's business.

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