besmirch somebody’s honour/reputationDAMAGEto spoil the good opinion that people have of someone 败坏[诋毁]某人的名誉
Examples from the Corpus
besmirch• Nor is it the first time that Rupert's good name has been besmirched.• And finally the bloodied body of the victim is carried out of town, a reputation besmirched, a political career ruined.• But under cross-examination, he was accused of deliberately setting out to besmirch her character.• This is just the latest in long line of such scandals, which besmirch the country's financial institutions as a whole.
Originbesmirch
(1600-1700)smirch“to make dirty”((15-20 centuries)), perhaps from Old Frenchesmorcher“to torture”