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English definition of “tighten”

tighten

verb  /ˈtɑɪt·ən/ us  

tighten verb (CONTROL)

[T] 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.

tighten verb (LIMIT)

[T] to make something less easily available: The government plans to tighten credit and slow the growth of the money supply.

tighten verb (MAKE FIRMER)

[I/T] to make something tighter, firmer, or less easy to move: [T] You’ve got to tighten the laces of your ice skates. [I] His arms tightened around her.
(Definition of tighten from the Cambridge Academic Content Dictionary © Cambridge University Press)
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