The term "white-collar" is a 20th-century American coinage that emerged alongside the growth of administrative and managerial work. It contrasts with "blue-collar," which refers to manual laborers who often wore durable, darker-colored clothing that could hide dirt and grime. The literal imagery of a clean, white shirt collar became a powerful metonym for clerical, administrative, and professional occupations that were performed in offices, free from physical labor and industrial soot. This compound perfectly encapsulates a social and economic distinction through the symbolic language of everyday attire.

Structure: white (color) + collar (garment part) - white: From Old English hwīt, meaning the color white. In this compound, it metaphorically represents the clean, unstained shirts typically worn by office workers. - collar: From Old French coler, from Latin collāre ("neckband, necklace"), from collum ("neck"). In this compound, it refers to the shirt collar as a synecdoche for professional attire.