'hard currency' definitions:

Definition of 'hard currency'

(from WordNet)
noun
A currency that is not likely to depreciate suddenly in value; "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; "there is a desperate shortage of hard cash" [syn: cash, hard cash, hard currency]