Source : Webster's Revised Unabridged Dictionary (1913)

Smudge \Smudge\, n. [Cf. Dan. smuds smut, E. smutch, or smoke.]
   1. A suffocating smoke. --Grose.

   2. A heap of damp combustibles partially ignited and burning
      slowly, placed on the windward side of a house, tent, or
      the like, in order, by the thick smoke, to keep off
      mosquitoes or other insects. [U. S.] --Bartlett.

   3. That which is smeared upon anything; a stain; a blot; a
      smutch; a smear.

Smudge \Smudge\, v. t. [imp. & p. p. {Smudged}; p. pr. & vb. n.
   {Smudging}.]
   1. To stifle or smother with smoke; to smoke by means of a
      smudge.

   2. To smear; to smutch; to soil; to blacken with smoke.

Source : WordNet®

smudge
     n 1: a smoky fire to drive away insects
     2: a blemish made by dirt; "he had a smudge on his cheek" [syn:
         {spot}, {blot}, {daub}, {smear}, {smirch}, {slur}]
     v : make a smudge on; soil by smudging [syn: {smear}, {blur}, {smutch}]