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English definition of “decelerate”

decelerate

verb [I]     /ˌdiːˈsel.ər.eɪt/ US  /-ə.reɪt/
to reduce the speed that a vehicle is travelling at: The car decelerated at the sight of the police car .Increasing and decreasing speed of motion to happen or make something happen more slowly Increasing and decreasing speed of motion → Compare accelerate
(Definition of decelerate verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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