black sheep

noun
🔊/ˌblæk ˈʃiːp/
🔊/ˌblæk ˈʃiːp/
[usually singular]
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  1. a person who is different from the rest of their family or another group, and who is considered bad or embarrassing有辱家族的人;害群之马
    • the black sheep of the family家族败类
    Word Originlate 18th cent.: from the proverb there is a black sheep in every flock.