上去 (shàng qù) is a directional verb meaning 'to go up' — it emphasizes movement upward away from the speaker. Unlike 上 (shàng), which can also mean 'get on a vehicle' or 'attend', 上去 is specifically about physically moving to a higher place. It contrasts with 进去 (jìn qù 'go in'), which is about entering, not ascending.