To be slowed or stopped by or as if by the operation of a brake.
(--- Physics) To change the velocity of.
To retard is to prevent progress or growth.
Find another word for decelerate. In this page you can discover 10 synonyms, antonyms, idiomatic expressions, and related words for decelerate, like: brake, slow, slow-down, accelerate, slow-up, retard, deceleration, pick-up-speed, forward motion and null.