[{"word":"jack-knife","phonetics":[],"meanings":[{"partOfSpeech":"noun","definitions":[{"definition":"A compact folding knife.","synonyms":[],"antonyms":[],"example":"He kept a jack-knife in his pocket for various tasks."},{"definition":"The front-dive pike, in which the body folds and unfolds.","synonyms":[],"antonyms":[],"example":"It took me hundreds of dives to master even the simple jackknife"},{"definition":"A semi-trailer truck accident in which the vehicle mimics the closing of a jack-knife.","synonyms":[],"antonyms":[],"example":"I have seen several jack-knives along that dangerous stretch of road."}],"synonyms":[],"antonyms":[]},{"partOfSpeech":"verb","definitions":[{"definition":"To fold in the middle, as a jackknife does.","synonyms":[],"antonyms":[],"example":"The cat jackknifed in the air and landed gracefully on its feet."},{"definition":"To cause a semi-trailer truck to fold like a jackknife in a traffic accident.","synonyms":[],"antonyms":[],"example":"Before I knew what was happening, I'd jack-knifed the truck."}],"synonyms":[],"antonyms":[]},{"partOfSpeech":"noun","definitions":[{"definition":"A resampling method that applies estimators to all subsamples that each omit a single different group (possibly of a single datapoint) of the original sample to provide a sample distribution of the estimate.","synonyms":[],"antonyms":[]}],"synonyms":["leave-one-out"],"antonyms":[]}],"license":{"name":"CC BY-SA 3.0","url":"https://creativecommons.org/licenses/by-sa/3.0"},"sourceUrls":["https://en.wiktionary.org/wiki/jack-knife","https://en.wiktionary.org/wiki/jackknife"]}]