Definitions from Wiktionary (cannonball)

▸ noun:  (military, weaponry)
▸ noun:  A spherical projectile fired from a smoothbore cannon.
▸ noun:  An explosive-filled hollow iron sphere fused through a hole and intended to explode at a calculated distance rather than explode on impact.
▸ noun:  (diving) 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.
▸ noun:  (slang, figuratively) Something that moves fast, especially a fast train.
▸ noun:  (tennis) A served ball that travels with great speed and describes little or no arc in flight.
▸ verb:  (intransitive) To jump or dive into water, performing a cannonball landing.
▸ verb:  (intransitive) To career; to move rapidly.
▸ Also see cannonball

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