







乌头马角 is a Chinese idiom (chengyu) meaning “refers to something utterly impossible or highly improbable to happen”. An unattainable feat. Literally, “Black crow's head turns white, horse grows horns”.
During the late Warring States period, Prince Dan of Yan was held as a hostage in Qin. After a conflict with King Ying Zheng of Qin, he was imprisoned.
Prince Dan pleaded to be allowed to return to his home country. King Qin replied, "I will grant your request only when a crow's head turns white and a horse grows horns."
Prince Dan could only sigh to the sky in despair. Perhaps heaven had eyes; a white-headed crow flew by outside his prison cell.
Faced with this extraordinary sight, the King of Qin had no choice but to send Prince Dan back to Yan.

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Open the tool →乌头马角 (wū tóu mǎ jiǎo) is a Chinese idiom (chengyu) meaning “refers to something utterly impossible or highly improbable to happen”.
乌头马角 is pronounced wū tóu mǎ jiǎo in Mandarin Chinese.
Literally, 乌头马角 means “Black crow's head turns white, horse grows horns”. It is used to mean “refers to something utterly impossible or highly improbable to happen”.
乌头马角 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
比喻不能实现之事。同“乌白马角”。