WordWeb Online

1. A blemish made by dirt
   "he had a smirch on his cheek";
   - smudge, spot, blot, daub, smear, slur
    
2. An act that brings discredit to the person who does it
   - blot, smear, spot, stain

1. Smear so as to make dirty or stained
   - besmirch
    
2. Charge falsely or with malicious intent; attack the good name and reputation of someone
   - defame, slander, asperse, denigrate, calumniate [formal], smear, sully, besmirch

Derived forms: smirching, smirches, smirched

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