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English definition of “tighten”

tighten

verb [T] (CONTROL)   /ˈtɑɪt·ən/
to strongly control something: Security was tightened at US embassies around the world . The government moved to tighten the rules on toxic substances in the air . [M] Our team will have to tighten up its defense if we want to win .
(Definition of tighten verb (CONTROL) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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