The Collaborative International Dictionary of English v.0.48:

Smear \Smear\ (sm[=e]r), v. t. [imp. & p. p. Smeared
   (sm[=e]rd); p. pr. & vb. n. Smearing.] [OE. smeren,
   smerien, AS. smierwan, smyrwan, fr. smeoru fat, grease; akin
   to D. smeren, OHG. smirwen, G. schmieren, Icel. smyrja to
   anoint. See Smear, n.]
   1. To overspread with anything unctuous, viscous, or
      adhesive; to daub; as, to smear anything with oil. "Smear
      the sleepy grooms with blood." --Shak.
      [1913 Webster]

   2. To soil in any way; to contaminate; to pollute; to stain
      morally; as, to be smeared with infamy. --Shak.
      [1913 Webster]

   3. To smudge, blur, or render indistinct (writing, pictures,
      etc.).
      [PJC]

   4. to vilify (a person); to damage (a person's reputation),
      especially falsely or by unfair innuendo, and with
      malicious intent.
      [PJC]