Antonyms of verb decelerate

2 senses of decelerate

Sense 1
decelerate, slow, slow down, slow up, retard -- (lose velocity; move more slowly; "The car decelerated")
       Antonym of accelerate (Sense 1)
      => accelerate, speed up, speed, quicken -- (move faster; "The car accelerated")

Sense 2
decelerate, slow down -- (reduce the speed of; "He slowed down the car")
       Antonym of accelerate (Sense 2)
      => accelerate, speed, speed up -- (cause to move faster; "He accelerated the car")

Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb decelerate

2 senses of decelerate

Sense 1
decelerate, slow, slow down, slow up, retard -- (lose velocity; move more slowly; "The car decelerated")
       => decrease, diminish, lessen, fall -- (decrease in size, extent, or range; "The amount of homework decreased towards the end of the semester"; "The cabin pressure fell dramatically"; "her weight fell to under a hundred pounds"; "his voice fell to a whisper")

Sense 2
decelerate, slow down -- (reduce the speed of; "He slowed down the car")
       => change, alter, modify -- (cause to change; make different; cause a transformation; "The advent of the automobile may have altered the growth pattern of the city"; "The discussion has changed my thinking about the issue")