besmirch
verb [ T ] literary uk/bɪˈsmɜːtʃ/ us/bɪˈsmɝːtʃ/
玷污;损害（名誉等）
to say bad things about someone to influence other people's opinion of them
His accusations were false, but they served to besmirch her reputation. 他的指控虽毫无根据，却损害了她的名誉。
Synonym: defame
Compare: slander verb