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jackknife

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jackknifing

Main Entry:: ²jackknife
Function:: verb
Date:: 1806

transitive verb

1 : to cut with a jackknife 2 : to cause to double up like a jackknife intransitive verb 1 : to double up like a jackknife <jackknifed into a seat beside me, folding up his six feet eight — Lady Bird Johnson> 2 : to turn and form an angle of 90 degrees or less with each other —used especially of a tractor-trailer combination

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