‘末日’ literally combines ‘末’ (mò), meaning ‘end,’ ‘final,’ or ‘tip,’ and ‘日’ (rì), meaning ‘day.’ Together, they form a compound noun meaning ‘doomsday’ or ‘the last day’ — typically referring to the catastrophic end of the world, civilization, or a specific era. It carries strong connotations of finality, judgment, and irreversible decline, often appearing in religious, apocalyptic, or metaphorical contexts.

In modern usage, ‘末日’ is frequently employed figuratively — for instance, to describe the collapse of a business, the end of a relationship, or even an extremely stressful situation (e.g., ‘考试末日’ — ‘exam doomsday’). While rooted in classical and literary Chinese, it remains common in news headlines, literature, film, and everyday speech when emphasizing dramatic, irreversible endings. It is more formal and weighty than colloquial alternatives like ‘最后一天’ (last day), and rarely used for neutral or positive conclusions.