







问牛知马 is a Chinese idiom (chengyu) meaning “to infer the truth of a matter by indirect inquiry or subtle observation; to deduce facts about one thing by asking about another related thing”. Literally, “Ask about the cow, then you'll know the horse”.
During the reign of Emperor Xuan of the Han Dynasty, Zhao Guanghan, the prefect of Yingchuan, was exceptionally intelligent and capable. He had a distinctive approach to managing local military and government affairs.
One day, he instructed his servant to go to the livestock market to purchase a horse. He told the servant to first inquire about the prices of dogs, sheep, and cattle, and only then to ask for the price of horses.
He explained that by comparing these prices, the servant would be able to buy the horse at a reasonable cost. The servant was greatly impressed by his wisdom.

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Open the tool →问牛知马 (wèn niú zhī mǎ) is a Chinese idiom (chengyu) meaning “to infer the truth of a matter by indirect inquiry or subtle observation; to deduce facts about one thing by asking about another related thing”.
问牛知马 is pronounced wèn niú zhī mǎ in Mandarin Chinese.
Literally, 问牛知马 means “Ask about the cow, then you'll know the horse”. It is used to mean “to infer the truth of a matter by indirect inquiry or subtle observation; to deduce facts about one thing by asking about another related thing”.
问牛知马 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
比喻从旁推究,弄清楚事情真相。