Definitions

1. verb

to murmur or speak in a low, indistinct voice.

“The crowd began to murr in disapproval.”

2. verb

to make a low, indistinct sound, typically to express discontent or boredom.

“The cat murrred in response to the annoying noise.”

3. noun

a low, indistinct sound, especially one of discontent or boredom.

“The murr of the crowd filled the auditorium.”