What is the opposite of speeding up?

Need antonyms for speeding up? Here's a list of opposite words from our thesaurus that you can use instead.

Verb
Opposite of present participle for to increase in speed
“It is also treated with inorganic salt solutions which slow down the combustion.”
Verb
Opposite of present participle for to hasten the progress of or make easier
“Although the pilot decided to slow the rate of descent and airspeed of the plane, there was no noticeable reduction in the level of vibration.”
Noun
Opposite of the act or condition of increasing in speed or rate
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