‘断肠’ is a classical Chinese idiom meaning deeply heartbreaking or agonizingly sorrowful—so painful it feels as if one’s intestines are breaking. Literally, 断 (duàn) means 'to break' or 'to sever', and 肠 (cháng) means 'intestine' or 'bowel'; together, they evoke visceral, physical pain caused by intense emotional suffering, especially grief, longing, or despair.

This expression originates from ancient poetry and remains common in literary, poetic, and formal contexts today. It is rarely used in casual speech but appears frequently in songs, novels, and emotional speeches to intensify the gravity of loss or unrequited love. While vivid and evocative, it carries strong dramatic weight—using it in everyday conversation (e.g., over minor disappointments) would sound exaggerated or theatrical.