slur

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

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"

a blemish made by dirt; "he had a smudge on his cheek"

play smoothly or legato; "the pianist slurred the most beautiful passage in the sonata"

speak disparagingly of; e.g., make a racial slur; "your comments are slurring your co-workers"

utter indistinctly

become vague or indistinct; "The distinction between the two theories blurred"