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slow (sb/sth) down/up

phrasal verb with slow
 
/sləʊ/
 
US  /sloʊ/ verb [I or T]

Definition

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 Learner's Dictionary & Thesaurus © Cambridge University Press)

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