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English definition of “tighten sth up”

tighten sth up

phrasal verb with tighten     /ˈtaɪ.tən/ verb [I or T]
to make something become tighter , firmer , or less easy to move : Now tighten up the screws .Tight and tightening
(Definition of tighten sth up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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