n.

1. 顽皮，淘气；胡闹，恶作剧[U]
   What mischief is he up to?

   他在搞什么恶作剧？

2. 损害，伤害，危害[U][S1]
   The frost did much mischief to the vegetables.

   霜冻使蔬菜受到了严重的损害。

3. 顽皮的孩子，淘气鬼[C]
   The boy is a regular mischief in school.

   这男孩在学校里是一个十足的淘气鬼。

4. 损害的根源，祸根[S]
   He is a real mischief to his family.

   他给家人招惹祸事。

5. 不和，争执[U]
   She tried to stir up mischief among the other pupils.

   她试图在其他学生之间挑起纠纷。

n.

1. playful misbehaviour or troublemaking.
2. harm or trouble caused by someone or something.
3. Law  a wrong or hardship which it is the object of a statute to remove or for which the common law affords a remedy.