Definitions from Wiktionary (jack-knife)

▸ noun:  A compact folding knife.
▸ noun:  The front-dive pike, in which the body folds and unfolds.
▸ noun:  (colloquial) A semi-trailer truck accident in which the vehicle mimics the closing of a jack-knife.
▸ verb:  To fold in the middle, as a jackknife does.
▸ verb:  (colloquial) To cause a semi-trailer truck to fold like a jackknife in a traffic accident.
▸ noun:  (statistics) Alternative spelling of jackknife [(statistics) 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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