Definitions

1. verb

to speak indistinctly or in a low, indistinguishable tone

“She began to mumble in her sleep, making it hard for me to understand what she was saying.”

2. noun

a low, indistinct sound made by speaking indistinctly

“The mumble of the crowd was difficult to make out as they chanted in unison.”

3. verb

to speak or utter something obscurely or unclearly

“He mumbled something about needing help, but I couldn’t quite decipher what he meant.”