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English definition of “tighten”

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 verb from the Cambridge Business English Dictionary © Cambridge University Press)
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