The Chinese word **填充** (tiánchōng) is a compound word formed through the common morphological process of **combination**, where two independent, meaningful characters are joined to create a new, specific meaning. The first character, **填** (tián), means "to fill" or "to stuff," often implying the act of putting material into a cavity or blank space. The second character, **充** (chōng), means "to fill," "to replenish," or "to suffice," carrying a sense of making something full or complete. When combined, they form a verb that semantically intensifies and specializes the core idea of filling, resulting in the meaning "to fill up" or "to pad," commonly used in contexts ranging from physical stuffing (like cushion filling) to digital actions (like filling cells in a spreadsheet or applying color in graphics).