VERB
敗壞…的名聲;使喪失信譽;使丟臉
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...
公司里設立的敗壞其主要競爭對手名聲的秘密部門
He says his accusers are trying to discredit government foreign-aid policies...
他說他的責難者試圖使政府的對外援助政策名聲掃地。