to reduce speed; as, The car decelerated. Opposite of accelerate.

to cause to reduce speed. Opposite of accelerate.

lose velocity; move more slowly; "The car decelerated"

reduce the speed of; "He slowed down the car"

The act of slowing a moving object. In CO2 racing, a car must be safely decelerated after it crosses the finish line.

To slow down. When an airplane comes in to land, it decelerates and rolls to a stop.