foreign exchange reserves
US /ˈfɔːr.ɪn ɪksˈtʃeɪndʒ rɪˈzɜːrvz/
UK /ˈfɔːr.ɪn ɪksˈtʃeɪndʒ rɪˈzɜːrvz/

1.
assets held by a central bank or monetary authority, usually in foreign currencies, used to back its liabilities and influence monetary policy
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The country's foreign exchange reserves have increased significantly this quarter.
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Maintaining sufficient foreign exchange reserves is crucial for economic stability.