noun

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.

verb

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.

noun

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.

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