jackknifes



We found a root(lemma) word : jackknife

a large knife with a folding blade.

a dive in which the body is first bent at the waist and then straightened.

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.

move one's body into a bent or doubled-up position

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definition by Oxford Dictionaries