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English definition of “tighten”

tighten

verb [I or T] uk   /ˈtaɪ.tən/ us  
B2 to become tighter or to make something become tighter, firmer, or less easy to move: Tighten the straps so they don't rub. As he struggled, the ropes tightened even more.Tight and tightening
(Definition of tighten from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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