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slow down [or] slow up

 
See:
slow
part of speech: phrase
definition 1: to proceed, move, or operate more slowly or calmly than before.
The car slowed down before making the turn.Slow down. I can't understand what you're saying.She doing a great job, but if she doesn't slow down, she will end up making herself ill.Work on the project has slowed down recently.
definition 2: to cause (someone or something) to proceed, move, or operate more slowly than before.
The conductor slowed down the tempo of the symphony's second movement.The injury slowed her down.The accident slowed down the traffic to nearly a halt.