Use the verb decelerate when you want to slow down, like when you realize you are missing important moments in life by racing around, trying to do everything yourself. If you make an effort to decelerate, you might be happier — and healthier.

Decelerate is the opposite of accelerate, which means "to go faster." Decelerate often describes slowing a vehicle, but it can relate to nearly anything, like a friendship that begins with hanging out nearly every day but decelerates when you move to a new town or get busy with school and sports. It doesn't mean the friendship is ending or over, just that the pace is now a little slower.

Definitions of decelerate
  1. verb
    lose velocity; move more slowly
    “The car decelerated
    synonyms: retard, slow, slow down, slow up
    see moresee less
    accelerate, quicken, speed, speed up
    move faster
    show 8 types...
    hide 8 types...
    slow, slow down, slow up
    cause to proceed more slowly
    delay, detain, hold up
    cause to be slowed down or delayed
    bog, bog down
    cause to slow down or get stuck
    clog, constipate
    impede with a clog or as if with a clog
    engage in delaying tactics or refuse to cooperate
    delay or hold up; prevent from proceeding on schedule or as planned
    deliberately delay an event or action
    buy time
    act so as to delay an event or action in order to gain an advantage
    type of:
    decrease, diminish, fall, lessen
    decrease in size, extent, or range
  2. verb
    reduce the speed of
    synonyms: slow down
    see moresee less
    accelerate, speed, speed up
    cause to move faster
    show 4 types...
    hide 4 types...
    make less fast or intense
    cause to move more slowly or operate at a slower rate
    slow down by moving the tail sideways
    lessen the momentum or velocity of
    type of:
    alter, change, modify
    cause to change; make different; cause a transformation
Word Family

Test prep from the experts

Boost your test score with programs developed by’s experts.

  • Proven methods: Learn faster, remember longer with our scientific approach.
  • Personalized plan: We customize your experience to maximize your learning.
  • Strategic studying: Focus on the words that are most crucial for success.


  • Number of words: 500+
  • Duration: 8 weeks or less
  • Time: 1 hour / week


  • Number of words: 500+
  • Duration: 10 weeks or less
  • Time: 1 hour / week