孤城落月
Meanings
1
feeling of helpless isolation; desolation of a fallen person
Literary four-character compound evoking the image of a solitary castle under a setting moon; used for the loneliness and helplessness of someone who has lost status, fortune, or companions.
After going bankrupt, he felt exactly like a solitary castle under a setting moon—utterly alone and helpless.
With his supporters gone, the aging politician was overcome by a deep sense of desolation.