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Related to slow up: get along
slow someone or something upand slow someone or something down
to cause someone or something to reduce speed. I'm in a hurry. Don't try to slow me down. Please slow up the train. There are sheep near the track.
to go slower; to reduce speed in order for someone or something to catch up. slow up a little! I can't keep up with you! Please slow up. I can't follow your lecture when you talk so fast.
Slacken or cause to slacken in speed, as in The train slowed up as it approached the curve, or Come on, you're slowing me up. [Late 1800s] Also see slow down, def. 1.
1. To delay someone or something; retard someone or something: Bad weather slowed up the project. The accident on the freeway slowed us up.
2. To move, work, or happen at a slower rate: Traffic slows up where the two freeways converge.