cannonball

noun

Pronunciation: /ˈkænənˌbɔːl/

Etymology: From cannon + ball from being a round ball that is fired from a cannon.

A spherical projectile fired from a smoothbore cannon.
An explosive-filled hollow iron sphere fused through a hole and intended to explode at a calculated distance rather than explode on impact.
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.
“The New Yorker, 30 August 2004, p.40”
“The cannonball could be called the S.U.V. of the pool — oversized, brash, hormonally hardwired.”
Something that moves fast, especially a fast train.
“Meetings of the model train club always begin with the song "Wabash Cannonball".”
A served ball that travels with great speed and describes little or no arc in flight.

Etymology: From cannon + ball from being a round ball that is fired from a cannon.

To jump or dive into water, performing a cannonball landing.
“He cannonballed into the pool, drenching us all.”
To career; to move rapidly.
“The car cannonballed past.”