1. [ noun ] a large knife with one or more folding blades
Synonyms: clasp_knife
Related terms: pocketknife
2. [ verb ] dive into the water bending the body at the waist at a right angle, like a jackknife
Related terms: dive sport
3. [ noun ] (sport) a dive in which the diver bends to touch the ankles before straightening out
Related terms: dive
Similar spelling:   jacksnipe