Slur

About

A "slur" is an insulting or disparaging remark or slight.

Sources

dictionary.com, "slur":

• definition 3 (verb): "to cast aspersions on; calumniate; disparage; depreciate"
  • The candidate was viciously slurred by his opponent.
• definition 8 (noun): "a disparaging remark or a slight":
  • quick to take offense at a slur
  • an ethnic slur against people of Irish descent

Merriam Webster, "slur":

• definition (noun) 1a: "an insulting or disparaging remark or innuendo : aspersion"
• definition (noun) 1b: "a shaming or degrading effect : stain, stigma"
• definition (verb) 1: "to cast aspersions on : disparage"
  • slurred his reputation