Why do you want to slander him?

你们干嘛要诋毁他？

youdao

This is pure slander and I'll Sue him for defamation if he doesn't apologize.

这纯属污蔑，如果他不向我道歉，我就控告他诽谤。

《新英汉大辞典》

He fanned the slander that Ruth seldom took a bath by sniffing hard and pretending to detect a horrible smell whenever the slugger came near him.

他散播诽谤说鲁斯很少洗澡，每当这位强击手靠近他时都要用力吸气，假装闻到难闻的气味。

youdao

The case went to trial with lightning speed, and last week a court in Almaty convicted Mr Abilov of slander, giving him an 18-month suspended sentence.

ECONOMIST: A setback for the opposition