decelerate

[dee-sel-uh-reyt]
verb (used with object), decelerated, decelerating.
1.
to decrease the velocity of: He decelerates the bobsled when he nears a curve.
2.
to slow the rate of increase of: efforts to decelerate inflation.
verb (used without object), decelerated, decelerating.
3.
to slow down: The plane decelerated just before landing.

Origin:
1895–1900; de- + (ac)celerate

deceleration, noun
decelerator, noun
nondeceleration, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
decelerate (diːˈsɛləˌreɪt)
 
vb
to slow down or cause to slow down
 
[C19: from de- + accelerate]
 
deceler'ation
 
n
 
de'celerator
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

decelerate
1899, from de- + (ac)celerate.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
So that the brain may decelerate mental action, probably.
They introduced tough labor laws designed to decelerate production of
  lower-value-added goods.
Decelerate smoothly, brake evenly, change gears as necessary.
If you belly flop, you decelerate quickly, and the impact feels rougher.
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