1) Accuse 2) Asperse 3) Bring dishonor upon 4) Calumniate 5) Charge 6) Defame 7) Denigrate 8) Discolor 9) Slander 10) Smear 11) Smirch 12) Sully 13) Tarnish 14) To debase 15) To make dirty 16) To soil 1) Asperse 2) Badmouth 3) Calumniate 4) Defame 5) Defile 6) Giveablackeyeto 7) Mar 8) Smear 9) Soil 10) Spot 11) Stain 12) Sully 13) Taint 14) Tar 15) Traduce 
• (v. t.) To smirch or soil; to discolor; to obscure. Hence: To dishonor; to sully.
Be·smirch' transitive verb [ imperfect & past participle Besmirched ; present participle & verbal noun Besmirching .] To smirch or soil; to discolor; to obscure. Hence: To dishonor; to sully. Shak. 
verb smear so as to make dirty or stained
to soil; tarnish; discolor. · to detract from the honor or luster of: to besmirch someone's good name.
[SAT terms] smear so as to make dirty or stained