Jack-knife meaning

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

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

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

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(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.

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(statistics) Alternative spelling of jackknife.
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To fold in the middle, as a jackknife does.

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

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

Before I knew what was happening, I'd jack-knifed the truck like nobody's business.

Before I knew what was happening, I'd jack-knifed.

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