The word "上去" is formed through the direct, sequential combination of two fundamental directional concepts: first, 上 (shàng), which conveys an upward or ascending movement, and second, 去 (qù), which conveys a movement away from a frame of reference (often the speaker). It visually and conceptually maps a complete path of motion, fusing the vertical trajectory of "上" with the departing trajectory of "去" to create a single, compound idea of "to go up (and away)".