Past tense of cannonball; moved or crashed with the force and speed of a cannonball, or performed a cannonball dive into water.
From cannonball (a solid metal sphere fired from a cannon) plus past tense suffix -ed. Cannonball as a verb developed from the explosive force of the projectile.
When someone 'cannonballed' into a swimming pool, they tucked into a ball to make the biggest splash possible—kids have been doing this for over a century, making it a word that bridges military history and playground fun.
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