What is the meaning of smear?

noun

• Slanderous defamation.
  • synonyms: vilification, malignment
• A thin tissue or blood sample spread on a glass slide and stained for cytologic examination and diagnosis under a microscope.
  • synonyms: cytologic smear, cytosmear
• A blemish made by dirt.
  • usage: "he had a smudge on his cheek"
  • synonyms: smudge, spot, blot, daub, smirch, slur
• An act that brings discredit to the person who does it.
  • usage: "he made a huge blot on his copybook"
  • synonyms: blot, smirch, spot, stain

verb

• Stain by smearing or daubing with a dirty substance.
• Make a smudge on; soil by smudging.
  • synonyms: blur, smudge, smutch
• Cover (a surface) by smearing (a substance. over it)
  • usage: "smear the wall with paint"; "daub the ceiling with plaster"
  • synonyms: daub
• Charge falsely or with malicious intent; attack the good name and reputation of someone.
  • usage: "The journalists have defamed me" "The article in the paper sullied my reputation"
  • synonyms: defame, slander, smirch, asperse, denigrate, calumniate, sully, besmirch