About
As a phono-semantic compound, 忪 features the heart radical 忄 on the left, linking it to emotional or psychological states, with 公 on the right providing the phonetic element. It appears almost exclusively in two binomes: when pronounced zhōng, 怔忪 (zhēngzhōng) denotes a state of terror or agitation; when pronounced sōng, 惺忪 (xīngsōng) describes the drowsy confusion upon waking. Its meaning consistently refers to a temporary psychological or cognitive condition.