be worn-out, emaciated, haggard
顦 centers on a state of severe physical decline: being worn-out, emaciated, or haggard, often from exhaustion or deprivation.
顦 combines 焦 (scorch, burn) with 頁 (head), suggesting a head or face that looks scorched or withered, i.e., haggard. The exact historical development is uncertain, but the component combination fits the meaning.
The left side 焦 looks like a bird being scorched over a fire, and the right side 頁 is a head. Imagine a person whose head looks scorched and withered from exhaustion: they are worn-out and haggard.
For ショウ, picture a haggard person trying to put on a show but collapsing from exhaustion: show -> ショウ, and their worn-out face reveals the truth.