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Once upon a time, there was a man who sold medicine for foot calluses in the market. He hung a signboard that read "For Imperial Use" outside his shop.
People ridiculed him for his dishonesty. When the emperor learned of this, he sent someone to summon the man and had him thrown into prison.
He was later released due to a general amnesty and returned home. He resumed his old business, but this time, he added four characters, "曾经宣唤" (once summoned by the emperor), to his signboard to attract customers.

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Open the tool →售胝足之药 (shòu zhī zú zhī yào) is a Chinese idiom (chengyu) meaning “to peddle quack remedies”.
售胝足之药 is pronounced shòu zhī zú zhī yào in Mandarin Chinese.
Literally, 售胝足之药 means “selling medicine for foot calluses”. It is used to mean “to peddle quack remedies”.
售胝足之药 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
胝:手掌或脚掌上的老茧。指卖狗皮膏药骗人