The Collaborative International Dictionary of English v.0.48:

Smirch \Smirch\, v. t. [From the root of smear.]
   To smear with something which stains, or makes dirty; to
   smutch; to begrime; to soil; to sully.
   [1913 Webster]

         I'll . . . with a kind of umber smirch my face. --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Smirch \Smirch\, n.
   A smutch; a dirty stain.
   [1913 Webster]

WordNet (r) 3.0 (2006):

smirch
    n 1: a blemish made by dirt; "he had a smudge on his cheek"
         [syn: smudge, spot, blot, daub, smear, smirch,
         slur]
    2: an act that brings discredit to the person who does it; "he
       made a huge blot on his copybook" [syn: blot, smear,
       smirch, spot, stain]
    v 1: smear so as to make dirty or stained [syn: smirch,
         besmirch]
    2: 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" [syn:
       defame, slander, smirch, asperse, denigrate,
       calumniate, smear, sully, besmirch]