‘消瘦’ is a compound verb meaning ‘to waste away’—referring to noticeable, often unhealthy weight loss due to illness, stress, or prolonged hardship. The first character 消 (xiāo) means ‘to disappear’ or ‘to diminish’, while the second character 瘦 (shòu) means ‘thin’ or ‘emaciated’. Together, they convey a gradual, visible reduction in body mass, usually implying physical decline rather than intentional dieting. It carries a somber or medical connotation and is commonly used in clinical descriptions, health reports, or empathetic observations.

This word is frequently found in formal or literary contexts—such as news articles about chronic disease, doctor-patient communication, or narrative writing describing someone’s deteriorating condition. It is not used for healthy weight loss (e.g., from exercise), nor for temporary thinness. Native speakers typically reserve it for situations where thinness signals underlying trouble: fatigue, depression, cancer, or malnutrition. Its tone is neutral-to-concerned, never casual or complimentary.