slur in WordNet English dictionary

1. 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"
   aspersion  slur 
   
2. a blemish made by dirt
   "he had a smudge on his cheek"
   smudge  spot  blot  daub  smear  smirch  slur 
   
3. (music) a curved line spanning notes that are to be played legato
   slur 
   

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