Nouns

(n)slur(music) a curved line spanning notes that are to be played legato
(n)aspersion, slura 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”
(n)smudge, spot, blot, daub, smear, smirch, slura blemish made by dirt“he had a smudge on his cheek”

Verbs

(v)slurplay smoothly or legato“the pianist slurred the most beautiful passage in the sonata”
(v)slurspeak disparagingly of; e.g., make a racial slur“your comments are slurring your co-workers”
(v)slurutter indistinctly
(v)blur, dim, slurbecome vague or indistinct“The distinction between the two theories blurred”