decelerated; decelerating
Definition of decelerate
1
: to reduce the speed of : slow down
decelerate a car
2
: to decrease the rate of progress of
decelerate growth decelerate soil erosion
: to move at decreasing speed
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Merriam-Webster unabridged
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Time Traveler for decelerate
The first known use of decelerate was in 1899
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