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What is the opposite of speeds up?

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

Opposite of to increase in speed
“It is also treated with inorganic salt solutions which slow down the combustion.”
Opposite of 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.”
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