上岗 (shàng gǎng) is a verb meaning 'to start work' or 'to take up a post', especially in formal, organizational, or professional contexts. The character 上 (shàng) means 'to go up' or 'to begin', while 岗 (gǎng) refers to a 'post', 'position', or 'duty station' — often used for jobs requiring specific responsibilities, such as security guards, factory workers, or medical staff. Together, they convey the idea of officially assuming one’s assigned duties after training, hiring, or assignment.

This term is commonly used in workplace announcements, HR documents, safety briefings, and vocational training. It implies readiness, qualification, and formal entry into active service — not just showing up, but being certified and authorized to perform the role. It's more formal than everyday phrases like 开始工作 (kāishǐ gōngzuò) and carries connotations of responsibility and accountability.