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Sanakirja

jack-knife []

n A compact folding knife.

n The front-dive pike, in which the body folds and unfolds.

n (colloquial) A semi-trailer truck accident in which the vehicle mimics the closing of a jack-knife.

n (statistics) (alternative spelling of|jackknife)

v To fold in the middle, as a jackknife does.

v (colloquial) To cause a semi-trailer truck to fold like a jackknife in a traffic accident.