"besmirching" in the verb sense
1. defame, slander, smirch, asperse, denigrate, calumniate, smear, sully, besmirch
charge falsely or with malicious intent attack the good name and reputation of someone
"The journalists have defamed me!"
"The article in the paper sullied my reputation"
2. smirch, besmirch
smear so as to make dirty or stained
Source: WordNet® (An amazing lexical database of English)
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