Etymology
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slur (n.)

"deliberate slight, disparaging or slighting remark," c. 1600, from dialectal slur "thin or fluid mud," from Middle English slore (mid-15c.), cognate with Middle Low German sluren, Middle Dutch sloren "to trail in mud." Related to East Frisian sluren "to go about carelessly," Norwegian slora "to be careless." Literal sense of "a mark, stain, smear" is from 1660s in English. The musical sense (1746) is from the notion of "sliding." Meaning "act or habit of slurring" in speech is from 1882.

slur (v.)

c. 1600, "smear, soil by smearing," from slur (n.). Meaning "disparage depreciate" is from 1650s. In music, from 1746; of speech, from 1893. Related: Slurred; slurring.

updated on October 13, 2013

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Definitions of slur from WordNet
1
slur (v.)
play smoothly or legato;
the pianist slurred the most beautiful passage in the sonata
slur (v.)
speak disparagingly of; e.g., make a racial slur;
your comments are slurring your co-workers
slur (v.)
utter indistinctly;
slur (v.)
become vague or indistinct;
Synonyms: blur / dim
2
slur (n.)
(music) a curved line spanning notes that are to be played legato;
slur (n.)
a disparaging remark;
it is difficult for a woman to understand a man's sensitivity to any slur on his virility
Synonyms: aspersion
slur (n.)
a blemish made by dirt;
Synonyms: smudge / spot / blot / daub / smear / smirch
From wordnet.princeton.edu, not affiliated with etymonline.