groschen; any of a number of (chiefly obsolete) coins with a related name; grosz (unit of currency in Poland, ¹⁄₁₀₀ of a zloty) / groschen; any of a number of (chiefly obsolete) coins with a related name; former unit of currency, worth ¹⁄₁₀₀ of a schilling / an unofficial name for a coin worth ¹⁄₁₀ of a main currency; a 10-pfennig coin / an unofficial name for a coin worth ¹⁄₁₀ of a main currency; a 10-cent coin / an unofficial name for a coin worth ¹⁄₁₀ of a main currency; any comparable coin in another currency

(idiomatic) to not be worth a dime

the penny drops

genitive singular of Groschen