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slow down [or] slow up

 
See:
slow
part of speech: phrase
definition 1: When you slow down, you decrease your speed. When a thing slows down, it goes or operates less fast 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: If something slows down another thing, it decreases its speed. It makes it go more slowly.
The accident slowed down the traffic this morning.