do oneself a mischief

• 伤害自己

do oneself a mischief的用法和样例：

例句

1. Likewise, the best thing a layperson can do if they find someone to be suicidal is to ask that person to promise not to harm themselves until professional help comes.
   同样的，在一个普通人面对具有自杀倾向的病人时，最好的做法是请求对方保证在得到专业帮助前不要去伤害自己。