







乌头白,马生角 is a Chinese idiom (chengyu) meaning “an impossibility”. Something that will never happen. Literally, “Crow's head turns white, horse grows horns”.
Towards the end of the Warring States period, Prince Dan of Yan was held as a hostage in the State of Qin. He had a conflict with King Ying Zheng of Qin and was subsequently imprisoned.
Prince Dan pleaded to be released and returned to his home country. The King of Qin mockingly 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 fate intervened, as a white-headed crow unexpectedly flew by outside his prison cell.
Seeing this, the King of Qin, despite his earlier words, had no choice but to send Prince Dan back to Yan.

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Open the tool →乌头白,马生角 (wū tóu bái , mǎ shēng jué) is a Chinese idiom (chengyu) meaning “an impossibility”.
乌头白,马生角 is pronounced wū tóu bái , mǎ shēng jué in Mandarin Chinese.
Literally, 乌头白,马生角 means “Crow's head turns white, horse grows horns”. It is used to mean “an impossibility”.
乌头白,马生角 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
比喻不可能出现的事。