研磨 (yán mò) literally combines 研 (yán), meaning 'to grind' or 'to rub finely', and 磨 (mò), meaning 'to grind' or 'to sharpen'. Together, they form a compound verb or noun meaning 'to grind' — especially the mechanical or manual process of crushing solid substances into fine particles. It’s commonly used for food preparation (e.g., coffee beans, spices, sesame seeds) and industrial contexts (e.g., grinding pigments or minerals).

As a verb, 研磨 is often followed by an object and may appear with aspect markers like 了 or 着 (e.g., 研磨好了). As a noun, it refers to the act or result of grinding — for instance, in phrases like 研磨过程 (grinding process) or 咖啡研磨 (coffee grinding). Unlike the more general verb 磨 (mó/mò), which can mean 'to wear down' or 'to polish', 研磨 emphasizes fine, controlled particle reduction and is rarely used metaphorically.