Princeton's WordNet

1. slur(noun)

   (music) a curved line spanning notes that are to be played legato

   Synonyms:
   smear, spot, blot, aspersion, smudge, smirch, daub

2. aspersion, slur(noun)

   a disparaging remark

   Synonyms:
   smear, daub, smudge, slur, spot, calumny, sprinkling, defamation, denigration, aspersion, smirch, blot, slander

3. smudge, spot, blot, daub, smear, smirch, slur(verb)

   a blemish made by dirt

   Synonyms:
   smudge, bit, patch, dapple, office, speckle, pip, touch, cytosmear, place, smear, aspersion, daub, fleck, cytologic smear, maculation, slur, post, stain, malignment, position, smirch, vilification, billet, blot, spotlight, spot, point, situation, berth, topographic point

4. slur(verb)

   play smoothly or legato

   Synonyms:
   blur, dim

5. slur(verb)

   speak disparagingly of; e.g., make a racial slur

   Synonyms:
   blur, dim

6. slur(verb)

   utter indistinctly

   Synonyms:
   blur, dim

7. blur, dim, slur(verb)

   become vague or indistinct

   Synonyms:
   smear, glaze over, smudge, slur, blur, blear, dip, dim, obnubilate, obscure, blind, confuse, film over, smutch