Grumble (sound)
A grumble is a sound or utterance that a human makes to themself, in a low, discontented way, usually in the form of a complaint. It can also be called a murmur or mutter.
When one grumbles, it usually occurs due to a negative experience. An example could be: Jack's boss did not give him the promotion, so Jack grumbled to himself in frustration. Another example using "mutter": Frank muttered about the high taxes that he has to pay. Finally, an example using "murmur": The crowd murmured when the musical act suddenly stopped performing and everyone had to leave.
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References
Retrieved from : http://en.wikipedia.org/wiki/Grumble_(sound)
