To hang a bull's head but sell horse meat; to practice fraud, sell inferior goods under a good name, or make false claims; to misrepresent.
这家店总是搞促销，但产品质量很差，真是悬牛头，卖马脯。
This store always runs promotions, but the product quality is very poor. It's truly a case of hanging a bull's head and selling horse meat.
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