tighten
/ˈtɑɪt·ən/ v [T] (CONTROL)Definition
› 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 v (CONTROL) from the Cambridge Academic Content Dictionary
© Cambridge University Press)
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