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slow down

slow down [or] slow up

 
See:
slow
part of speech: phrase
definition 1: to go or operate with less speed than before.
Slow down. You're driving too fast!Please slow down. I can't understand what you're saying.The car slowed down before going around the turn.
definition 2: to cause (someone or something) to go or operate more slowly than before.
The injury slowed down my grandmother a lot.The accident slowed down the traffic this morning.