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English definition of “tighten sth up”

tighten sth up

verb [I or T] uk phrasal verb with tighten   /ˈtaɪ.tən/ us  
to make something become tighter, firmer, or less easy to move: Now tighten up the screws.
(Definition of tighten sth up phrasal verb, verb from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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