1. An act that brings discredit to the person who does it
   "The scandal was a smirch on his reputation";
   - blot, smear, spot, stain
    
2. A mark, stain, or discolouration, especially one made in a messy or accidental way
   "he had a smirch on his cheek";
   - smudge, spot, blot, daub, smear

1. Charge falsely or with malicious intent; attack the good name and reputation of someone
   "The tabloids tried to smirch the celebrity's reputation";
   - defame, slander, asperse, denigrate, calumniate [formal], smear, sully, besmirch
    
2. Smear so as to make dirty or stained
   "His reputation was smirched by the scandal";
   - besmirch

Derived forms: smirched, smirching, smirches

Type of: accuse, blemish, charge, defect, error, fault, mar, mistake, smear