Found 2 items, similar to jackknife.
English → English (WordNet) Definition: jackknife jackknife n 1: a large knife with one or more folding blades [syn: clasp knife ] 2: a dive in which the diver bends to touch the ankles before straightening out v : dive into the water bending the body at the waist at a right angle, like a jackknife [also: jackknives (pl)]
English → English (gcide) Definition: Jackknife Jackknife \Jack"knife`\, n. A large, strong clasp knife for the pocket; a pocket knife. [1913 Webster]