definition
A compact folding knife.
example
He kept a jack-knife in his pocket for various tasks.
definition
The front-dive pike, in which the body folds and unfolds.
example
It took me hundreds of dives to master even the simple jackknife
definition
A semi-trailer truck accident in which the vehicle mimics the closing of a jack-knife.
example
I have seen several jack-knives along that dangerous stretch of road.
definition
To fold in the middle, as a jackknife does.
example
The cat jackknifed in the air and landed gracefully on its feet.
definition
To cause a semi-trailer truck to fold like a jackknife in a traffic accident.
example
Before I knew what was happening, I'd jack-knifed the truck.
definition
A resampling method that applies estimators to all subsamples that each omit a single different group (possibly of a single datapoint) of the original sample to provide a sample distribution of the estimate.
Slowly jackknife your body upwards as you roll the ball down towards your feet.
This particular machine supports your head, neck, shoulders, and body, allowing you to safely engage in the "jackknife" position that is commonly associated with abdominal workout routines without strain or stress on other body parts.
Concentrate on your lower abs as you slowly jackknife your body upwards while rolling the ball down towards your feet.
For a more advanced workout to complete the 6 best ab exercises, you can try the ball tuck-in exercise, sometimes also called the jackknife.
Now, when's the last time you saw that jackknife Claudia gave you last summer?
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