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English definition of “tighten”

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tighten

verb [I or T]
 
 
/ˈtaɪtən/
( also tighten up) GOVERNMENT, LAW to make a rule, system, or law stronger and more difficult to ignore: tighten controls/rules/regulation There were renewed calls to tighten controls on imported products.
ECONOMICS, FINANCE limiting the amount of money that people and companies are able to borrow or spend, for example, by increasing interest rates: Central banks were expected to respond by tightening monetary policy.
ECONOMICS, COMMERCE if a market tightens, there becomes less of something available than is wanted or needed: The global market for nurses is tightening.
tighten your belt to spend less money than usual for a period of time because you do not have as much money: The major supermarkets have started a price war as customers tighten their belts. →  See also belt-tightening
(Definition of tighten from the Cambridge Business English Dictionary © Cambridge University Press)
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