1. a black sheep : 败家子, 败类, 害群之马；
名词
家庭
1. 羊;绵羊
A sheep is a farm animal which is covered with thick curly hair called wool. Sheep are kept for their wool or for their meat.
2. 盲从者;随波逐流者
If you say that a group of people are like sheep, you disapprove of them because if one person does something, all the others copy that person.
3. see also: black sheep
1. woolly usually horned ruminant mammal related to the goat
2. a docile and vulnerable person who would rather follow than make an independent decision
e.g. his students followed him like sheep
3. a timid defenseless simpleton who is readily preyed upon