“泼脏水”，字面意思“splash dirty water”，泛指对人造谣歪曲，决心中伤（slander），经常使用表达如“朝或人泼脏水”，与英语习语“hurl/throw/sling mud at somebody”意思附近，暗示“to say insulting or unfair things about someone, especially to try to damage their reputation”。
为了毁谤她的名望，有人不断地往她身上泼脏水。
Someone has kept throwing mud at her in order to vilify her reputation.
他是那种当面胁肩谄笑，背地里泼脏水的人。
He was the kind of person who would flatter you to your face, and then slander you behind your back.