noun
sexual liaison; amorous encounter
A literary yojijukugo derived from a Chinese legend about a king's dream encounter with a goddess on Mount Wu. Used in classical or poetic contexts to refer to a romantic or sexual meeting.
巫山雲雨の故事は、中国の古典に由来する。
The story of the amorous encounter on Mount Wu originates from classical Chinese literature.
From the Chinese legend of King Huai of Chu, who dreamed of a goddess on Mount Wu (巫山) and shared clouds and rain (雲雨) with her, a classical euphemism for sexual union.