The compound word "穿梭" (chuānsuō) is formed through the metaphorical combination of two characters: "穿" (chuān), meaning "to pierce through" or "to pass through", and "梭" (suō), which refers to a "shuttle" used in weaving. Together, they create a vivid image of a shuttle rapidly moving back and forth through the warp threads on a loom, which is extended metaphorically to describe any action of moving quickly and repeatedly through a space or between places, such as people weaving through a crowd or vehicles moving through traffic.