英文 文化裡,咩叫做 black sheep?

Black sheep (n) [C usually singular]
Someone who is regarded by other members of their family or group as a failure or embarrassment

From Longman Dictionary of Contemporary English

Person regarded as a disgrace or a failure by other members of his family or group 害群之馬,敗類

From 牛津高階

佗衰家
A member of a family or other group who is considered undesirable or disreputable.

black sheep 害群之馬

中文跟英文有異亦有同 :

black sheep 之中文通常譯作 - 害群之馬

英語成語：black sheep 即是 中文的害群之馬

以危害馬群的劣馬，比喻危害大眾的人。

一群綿羊中有時會出現一隻長有黑毛的羊(black sheep)，這隻黑羊屬於少數的異類，而且不及長白毛的綿羊值錢，多被視為無用之輩，影響群體利益。 這句成語就是取喻於綿羊，當中的黑羊常被引伸為不良分子。

敗類,害群之馬