1. heavy metal balls fired from cannons as ammunition
Usage: historical
2. a jump into water with knees drawn up to the chest, creating a large splash
Usage: informal

1. to jump into water in a cannonball position
Usage: informal
2. to move very fast
Usage: informal

Examples

• The museum displayed old cannonballs from the Civil War.
• Pirates loaded their cannons with iron cannonballs.
• The kids took turns doing cannonballs off the diving board.
• His cannonball created a huge splash that soaked everyone nearby.
• She cannonballs into the pool every summer.
• The car cannonballs down the highway at dangerous speeds.
• He cannonballed through his homework to get outside faster.