noun
emaciation from grief
A yojijukugo describing extreme weight loss and physical decline due to deep sorrow, often from mourning a loved one. Literary and somewhat rare.
彼女は夫を亡くしてから哀毀骨立の様相を呈している。
Since losing her husband, she has taken on an appearance of emaciation from grief.
A yojijukugo of Chinese origin, combining 哀 (grief), 毀 (damage/decline), 骨 (bone), and 立 (stand), literally 'grief damages the bones so they stand out'. The exact historical derivation is uncertain.