Verb decelerate has 2 senses
  1. decelerate, slow, slow down, slow up, retard - lose velocity; move more slowly; "The car decelerated"
    --1 is one way to decrease, diminish, lessen, fall
    Antonyms: accelerate, speed up, speed, quicken
    Derived form: noun deceleration1
    Sample sentences:
    Something ----s
    Somebody ----s
    Somebody ----s something
    Something ----s something
  2. decelerate, slow down - reduce the speed of; "He slowed down the car"
    --2 is one way to modify, qualify
    Antonyms: accelerate, speed, speed up
    Derived form: noun deceleration1
    Sample sentences:
    Somebody ----s something
    Somebody ----s somebody
    Something ----s somebody
    Something ----s something
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