泼脏水,字面意思splash dirty water,泛指对人造谣污蔑,刻意中伤(slander),与英文习语hurl/throw/sling mud at somebody意思相近,表示to say insulting or unfair things about someone, especially to try to damage their reputation。
例句:
为了诋毁她的名誉,有人不停地往她身上泼脏水。
Someone has kept throwing mud at her in order to vilify1 her reputation.