de·cel·er·ate

[dee-sel-uh-reyt] verb, de·cel·er·at·ed, de·cel·er·at·ing.
verb (used with object)
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)
3.
to slow down: The plane decelerated just before landing.

Origin:
1895–1900; de- + (ac)celerate

de·cel·er·a·tion, noun
de·cel·er·a·tor, noun
non·de·cel·er·a·tion, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To decelerate
Collins
World English Dictionary
decelerate (diːˈsɛləˌreɪt) [Click for IPA pronunciation guide]
 
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Decelerate is one of our favorite verbs.
So is skedaddle. Does it mean:
to run away hurriedly; flee.
to introduce subtleties into or argue subtly about.
Etymonline
Word Origin & History

decelerate
1899, from de- + (ac)celerate.
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
Example sentences
Cite factors which might accelerate or decelerate the work and your reason for
  taking this approach as opposed to others.
If you belly flop, you decelerate quickly, and the impact feels rougher.
So that the brain may decelerate mental action, probably.
Service brakes applied with no intent to decelerate the vehicle.
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