Brass meaning : A metallic alloy of copper and zinc used in many industrial and plumbing applications. A class of wind instruments, usually made of metal (such as brass), that use vibrations of the player's lips to produce sound; the section of an orchestra that features such instruments Spent shell casings (usually made of brass); the part of the cartridge left over after bullets have been fired. The colour of brass. (used as a singular or plural noun, metonym) High-ranking officers. A brave or foolhardy attitude; impudence. Money. Inferior composition. To coat with brass. Made of brass, of or pertaining to brass. Of the colour of brass. Impertinent, bold: brazen. Bad, annoying; as wordplay applied especially to brass instruments. Of inferior composition.