四大美女 (Sì Dà Meĭnǚ), The Four Great Beauties, are legendary Chinese women, all of whom have inspired idioms that are used to describe people who are exceptionally beautiful:
There was Xī Shī, who was so beautiful that when fish saw her reflection in the water, they would forget how to swim and sink to the bottom of the lake. There was Zhāo Jūn, whose beauty would make birds fall out of the sky. Diāo Chán was so radiant that the moon itself would hide away in shame upon seeing her, and Guì Feī’s face made all the flowers hide away in embarrassment when she walked by.
Because of their beauty, they were involved in great love stories, wars, and imperial feuds, embodying a fifth idiom, 倾城倾国 (qīngchéng qīngguó), roughly meaning “so beautiful that she lays waste to cities and lands”.
Stampworthy. Sina Blog