(idiom) to use a reputable name as a cover for dishonest deeds; to pass off low-quality goods or services as something better; dishonest advertising

Literally hanging a sheep's head while selling dog meat; describes dishonest advertising, deceptive practices, or doing wicked things under a virtuous name.

to display a sheep's head while boiling dog meat; to use a false facade to deceive people or sell inferior goods

A title or distinction that loses its value because it has been granted too freely or to unworthy people; originally a metaphor for the excessive awarding of titles during the later Han Dynasty.

to cheat or use dishonest advertising; literally "to hang a sheep's head while selling dog meat", describing wicked deeds carried out under a banner of virtue

(idiom) people of lowly social background who hold high government posts; used to satirize the filling of official positions with unqualified or corrupt individuals

To display a sign for high-quality goods while selling something inferior; figuratively, to do bad things under the guise of an honorable name.