from The American Heritage® Dictionary of the English Language, 4th Edition
- transitive v. To stain; sully: a reputation that was besmirched by slander.
- transitive v. To make dirty; soil.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To make dirty; to soil.
- v. To tarnish, especially someone's reputation; to debase.
from the GNU version of the Collaborative International Dictionary of English
- transitive v. To smirch or soil; to discolor; to obscure. Hence: To dishonor; to sully.
from The Century Dictionary and Cyclopedia
- To soil; discolor, as with soot or mud; hence, to sully; obscure.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- v. smear so as to make dirty or stained
- v. charge falsely or with malicious intent; attack the good name and reputation of someone
From be- + smirch. (Wiktionary)