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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 a rule , system , or law stronger and more difficult to avoid or ignore : Are there any plans to tighten up on advertising controls ?Becoming and making stronger
(Definition of tighten (sth) up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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