n. an act that brings discredit to the person who does it; "he made a huge blot on his copybook"

n. a thin tissue or blood sample spread on a glass slide and stained for cytologic examination and diagnosis under a microscope

n. slanderous defamation

v. 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"

v. cover (a surface) by smearing (a substance) over it; "smear the wall with paint"; "daub the ceiling with plaster"

v. make a smudge on; soil by smudging

v. stain by smearing or daubing with a dirty substance