[{"Bold_text": "noun", "List Items": ["a large pocketknife.", "Fancy Diving.a dive in which the diver bends in midair to the toes, keeping the legs straight, and then straightens out."]}, {"Bold_text": "verb (used without object)", "List Items": ["to bend or double over like a jackknife:The prizefighter jackknifed and fell when he was hit in the stomach.", "(of a trailer truck) to have the cab and trailer swivel at the linkage until they form a Vshape, as the result of an abrupt stop or accident.", "(in diving) to perform a jackknife.", "to move rapidly at an abrupt angle."]}, {"Bold_text": "verb (used with object)", "List Items": ["to cause to jackknife:The blow jackknifed the prizefighter.", "to cut with a jackknife."]}, {"Bold_text": "adjective", "List Items": ["resembling a jackknife, as in its shape, function, or manner of opening and folding."]}]