The word 回合 is formed by combining two distinct actions into a single conceptual unit of interaction. The character 回 (huí) means to return or circle back, suggesting a coming back to a starting point or a reciprocal action. The character 合 (hé) means to close, join, or meet, suggesting a coming together or an engagement. When fused, they create the idea of a complete cycle of mutual engagement, one party acts, the other responds, and the sequence closes to form one measurable "round" or "turn", as in a combat exchange or a game. It visually encapsulates the back-and-forth rhythm of an encounter into a defined segment.