VERB
败坏…的名声;使丧失信誉;使丢脸
To discredit someone or something means to cause them to lose people's respect or trust.
例句
...a secret unit within the company that had been set up to discredit its major rival...
公司里设立的败坏其主要竞争对手名声的秘密部门
He says his accusers are trying to discredit government foreign-aid policies...
他说他的责难者试图使政府的对外援助政策名声扫地。