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noun (plural jackknives)
1a knife with a folding blade. 2a dive in which the body is first bent at the waist and then straightened. 3 Statistics a method of assessing the variability of data by repeating a calculation on the sets of data obtained by removing one value from the complete set.
verb (jackknifed, jackknifing) [with object]
move (one’s body) into a bent or doubled-up position:the Major jackknifed his thin body at the waist [no object]:she jackknifed into a sitting position [no object] (of an articulated vehicle) bend into a V-shape in an uncontrolled skidding movement. [no object] (of a diver) perform a jackknife.