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English definition of “tighten”

tighten

verb [I or T]     /ˈtaɪ.tən/
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 verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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