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
To fold in the middle, as a jackknife does.
The cat jackknifed in the air and landed gracefully on its feet.
To cause a semi-trailer truck to fold like a jackknife in a traffic accident.
The numerical value of jack-knife in Chaldean Numerology is: 1
The numerical value of jack-knife in Pythagorean Numerology is: 7
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