‘三更’ (sān gēng) literally means ‘third watch’ and refers to the traditional Chinese timekeeping system, in which the night was divided into five two-hour watches. The third watch spans from 11:00 p.m. to 1:00 a.m., with its midpoint at midnight — hence ‘三更’ is commonly used poetically or idiomatically to mean ‘midnight’. The character 三 (sān) means ‘three’, and 更 (gēng) originally meant ‘to change’ or ‘a watch’, reflecting the changing of night guards during imperial times.

This term appears frequently in classical poetry, idioms (e.g., 三更半夜), and literary descriptions to evoke stillness, solitude, or late-night activity. While modern Mandarin speakers understand it as ‘midnight’, it’s rarely used in casual speech for telling time; instead, it carries a literary, historical, or atmospheric nuance — often suggesting quietude, secrecy, or perseverance through the night.