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English definition of “slow (sb/sth) down/up”

slow (sb/sth) down/up

verb [I or T] uk phrasal verb with slow   /sləʊ/ us    /sloʊ/
B2 to become slower, or to make someone or something become slower: Slow down, you two, you're walking too fast! If I run with Christina she tends to slow me down. We slowed up when we saw the police.Increasing and decreasing speed of motion
(Definition of slow (sb/sth) down/up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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