The Chinese word **空闲 (kòngxián)** is a compound formed by combining two synonymous characters, each contributing to the overarching concept of "free time" or "idleness." The first character, **空 (kòng)**, primarily means "empty" or "unoccupied," often referring to a vacant space or period in time. The second character, **闲 (xián)**, carries the meaning of "leisure," "idleness," or being "free from work." When paired, they create a cohesive binome where **空** emphasizes the state of having an open, unoccupied slot, and **闲** adds the nuance of leisurely availability, together precisely denoting the condition or time when one is free and at leisure.