currency peg
US /ˈkɝː.ən.si peɡ/
UK /ˈkɝː.ən.si peɡ/

1.
a policy in which a country's currency value is fixed against the value of another single currency or a basket of other currencies
:
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Many countries use a currency peg to stabilize their exchange rates.
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The central bank decided to maintain the currency peg despite economic pressures.