Centerboard (noun)

A retractable or removable fin-like device that can be lowered into the water from the center of a sailboat or other shallow-draft vessel to counteract the lateral force of the wind and increase stability and maneuverability.

Origin:

A board that is placed in the center of a sailboat or other vessel used to control the direction and stability of the boat.

Examples:

1. The sailor lowered the centerboard to keep the boat from drifting off course.
2. The centerboard was damaged during the storm.
3. He raised the centerboard to sail in shallow water.
4. The centerboard gave the boat added stability and control.
5. The centerboard was made of a durable material to withstand the constant wear and tear.