The aim of this article is to explore to what extent the rule of economics commonly known as Gresham's law (“bad money drives out good money”) can be extrapolated to verbal language (“bad concepts drive out good concepts”). Consequently, the goal of this article is twofold. First, for Gresham's law to be applied simultaneously to money and language, its unfortunate (“good”/“bad”) and obscure (“drives out”) wording should be clarified. Second, one should identify the contexts in which the validity of the law could be assessed best, and run a very preliminary test. For this purpose, the circulation of the adjective (“hard”, “strong”, or “stable” in Russian) in the word combination (“hard currency”) in use in the Soviet Union in the 1920s and 1930s was scrutinized.