An insult or slight.

“a racial slur”

A set of notes that are played legato, without separate articulation.

The symbol indicating a legato passage, written as an arc over the slurred notes (not to be confused with a tie).

To insult or slight.

To run together; to articulate poorly.

“to slur syllables;  He slurs his speech when he is drunk.”

To play legato or without separate articulation; to connect (notes) smoothly.