The Collaborative International Dictionary of English v.0.48:

Slur \Slur\ (sl[^u]r), v. t. [imp. & p. p. Slurred (sl[^u]rd);
   p. pr. & vb. n. Slurring (sl[^u]r"r[i^]ng).] [Cf. OE. sloor
   mud, clay, Icel. sl[=o]ra, slo[eth]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.
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   2. To disparage; to traduce. --Tennyson.
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   3. To cover over; to disguise; to conceal; to pass over
      lightly or with little notice.
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            With periods, points, and tropes, he slurs his
            crimes.                               --Dryden.
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   4. To cheat, as by sliding a die; to trick. [R.]
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            To slur men of what they fought for.  --Hudibras.
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   5. To pronounce indistinctly; as, to slur syllables; to slur
      one's words.
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   6. (Mus.) To sing or perform in a smooth, gliding style; to
      connect smoothly in performing, as several notes or tones.
      --Busby.
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   7. (Print.) To blur or double, as an impression from type; to
      mackle.
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The Collaborative International Dictionary of English v.0.48:

Slurred \Slurred\ (sl[^u]rd), a. (Mus.)
   Marked with a slur; performed in a smooth, gliding style,
   like notes marked with a slur.
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WordNet (r) 3.0 (2006):

slurred
    adj 1: spoken as if with a thick tongue; "the thick speech of a
           drunkard"; "his words were slurred" [syn: slurred,
           thick]