The act of jumping (typically into a swimming pool) with the legs bent and the arms wrapped around the knees to create a large splash, mimicking the flight and shape of a cannonball.
An explosive-filled hollow iron sphere fused through a hole and intended to explode at a calculated distance rather than explode on impact.
A spherical projectile fired from a smoothbore cannon.
Something that moves fast, especially a fast train.
A served ball that travels with great speed and describes little or no arc in flight.
To jump or dive into water, performing a cannonball landing.
To career; to move rapidly.