1. (noun) a large knife with one or more folding blades

• clasp knife

1. (verb) dive into the water bending the body at the waist at a right angle, like a jackknife

• athletics
• sport

1. (noun) a large knife with one or more folding blades

• pocket knife
• pocketknife

2. (noun) a dive in which the diver bends to touch the ankles before straightening out

• dive
• diving

3. (verb) dive into the water bending the body at the waist at a right angle, like a jackknife

• dive