The word 发烧 (fāshāo), meaning "to have a fever", is formed through a direct and vivid conceptual combination of its two component characters. The first character, 发 (fā), carries the core meaning of "to emit" or "to send out". The second, 烧 (shāo), means "to burn". When combined, they create a transparent metaphorical image: the condition is conceptualized as the body "emitting burning heat", visually and sensibly describing the primary symptom of elevated body temperature and the feeling of being aflame with illness.