defend sb. against an injustice

• 打抱不平

defend sb. against an injustice的用法和样例：

例句

1. He was always ready to defend the weak and helpless.
   他是个爱打抱不平的人。
2. Perhaps Dobbin's foolish soul revolted against that exercise of tyranny.
   也许都宾是傻好人，看了暴虐的行为忍不住要打抱不平。