Jack-knife - definition, pronunciation, transcription

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Amer.  |ˈdʒæk naɪf|
Brit.  |ˈdʒæk næɪf|  British pronunciation of the word jack-knife

noun

- 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.
- (statistics) Alternative spelling of jackknife.

verb

- 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 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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