Source : Webster's Revised Unabridged Dictionary (1913)

Slur \Slur\, v. t. [imp. & p. p. {Slurred}; p. pr. & vb. n.
   {Slurring}.] [Cf. OE. sloor mud, clay, Icel. sl?ra, slo?ra,
   to trail or drag one's self along, D. sleuren, sloren, to
   train, to drag, to do negligently and slovenly, D. sloor,
   sloerie, a sluttish girl.]
   1. To soil; to sully; to contaminate; to disgrace.
      --Cudworth.

   2. To disparage; to traduce. --Tennyson.

   3. To cover over; to disguise; to conceal; to pass over
      lightly or with little notice.

            With periods, points, and tropes, he slurs his
            crimes.                               --Dryden.

   4. To cheat, as by sliding a die; to trick. [R.]

            To slur men of what they fought for.  --Hudibras.

   5. To pronounce indistinctly; as, to slur syllables.

   6. (Mus.) To sing or perform in a smooth, gliding style; to
      connect smoothly in performing, as several notes or tones.
      --Busby.

   7. (Print.) To blur or double, as an impression from type; to
      mackle.

Slur \Slur\, n.
   1. A mark or stain; hence, a slight reproach or disgrace; a
      stigma; a reproachful intimation; an innuendo. ``Gaining
      to his name a lasting slur.'' --South.

   2. A trick played upon a person; an imposition. [R.]

   3. (Mus.) A mark, thus [[upslur] or [downslur]], connecting
      notes that are to be sung to the same syllable, or made in
      one continued breath of a wind instrument, or with one
      stroke of a bow; a tie; a sign of legato.

   4. In knitting machines, a contrivance for depressing the
      sinkers successively by passing over them.

Source : WordNet®

slur
     n 1: (music) a curved line spanning notes that are to be played
          legato
     2: a disparaging remark; "in the 19th century any reference to
        female sexuality was considered a vile aspersion"; "it is
        difficult for a woman to understand a man's sensitivity to
        any slur on his virility" [syn: {aspersion}]
     3: a blemish made by dirt; "he had a smudge on his cheek" [syn:
         {smudge}, {spot}, {blot}, {daub}, {smear}, {smirch}]
     [also: {slurring}, {slurred}]

slur
     v 1: play smoothly or legato; "the pianist slurred the most
          beautiful passage in the sonata"
     2: speak disparagingly of; e.g., make a racial slur; "your
        comments are slurring your co-workers"
     3: utter indistinctly
     4: become vague or indistinct; "The distinction between the two
        theories blurred" [syn: {blur}, {dim}] [ant: {focus}]
     [also: {slurring}, {slurred}]