1. to move in a series of up-and-down motions, like a porpoise jumping in and out of water
Usage: present participle of porpoise; commonly used in automotive and aerospace contexts

1. the action or motion of moving up and down repeatedly in a rhythmic pattern
Usage: gerund form; often used to describe vehicle or aircraft behavior

Examples

• The boat was porpoising through the rough waves.
• The car's suspension caused it to porpoise when braking suddenly.
• The aircraft experienced porpoising during landing.
• Dolphins were porpoising alongside the ship.
• The porpoising motion made the ride uncomfortable for passengers.
• Engineers worked to reduce the vehicle's porpoising at high speeds.