hard currency

(noun) a currency that is not likely to depreciate suddenly in value. Synonyms: hard currency. Examples: "The countries agreed to conduct their bilateral trade in hard currency, replacing previous barter arrangements." "Germany once had a solid economy, good fiscal and monetary policies, and a hard currency."

(noun) money in the form of bills or coins. Synonyms: cash, hard cash, hard currency. Example: "There is a desperate shortage of hard cash."