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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 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 phrasal verb, verb from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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