JACKKNIFE
- a large clasp knife [n JACKKNIVES] / to fold up like a jackknife [v JACKKNIFED, JACKKNIFING, JACKKNIFES]
- A 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
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