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Entry 2 senses · 2 variants Webster, 1913

decelerate

· IPA /diːˈsɛləɹeɪt/
01 v. i. to reduce speed; as, The car decelerated. Opposite of accelerate.
  1. 1.
    to reduce speed; as, The car decelerated. Opposite of accelerate.
Syn. slow, slow down, slow up, retard.
02 v. t. to cause to reduce speed. Opposite of accelerate.
  1. 1.
    to cause to reduce speed. Opposite of accelerate.
Syn. slow down.