If you sue someone, you start a legal case against them, usually in order to claim money from them because they have harmed you in some way.
双语例句
例： Mr Warren sued for libel over the remarks.
沃伦先生对那些评论提起诽谤诉讼。
例： The company could be sued for damages.
该公司可能会被起诉，被要求赔偿损失。