







乌白马角 is a Chinese idiom (chengyu) meaning “refers to utterly impossible or highly improbable events”. Something that will never happen, an insurmountable impossibility. Literally, “Crows turn white and horses grow horns”.
In the late Warring States period, Prince Dan of Yan was held hostage in Qin. He had a conflict with King Ying Zheng of Qin and was subsequently imprisoned.
Prince Dan requested to be allowed to return to his home country. King Qin replied, "Only when the crow's head turns white and the horse grows horns will I agree." Prince Dan could only sigh to the heavens.
Perhaps fate intervened, as a white-headed crow flew outside his prison cell. Reluctantly, King Qin had to send Prince Dan back to Yan.

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Open the tool →乌白马角 (wū bái mǎ jiǎo) is a Chinese idiom (chengyu) meaning “refers to utterly impossible or highly improbable events”.
乌白马角 is pronounced wū bái mǎ jiǎo in Mandarin Chinese.
Literally, 乌白马角 means “Crows turn white and horses grow horns”. It is used to mean “refers to utterly impossible or highly improbable events”.
乌白马角 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
乌鸦变白,马头生角。比喻不能实现之事。