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Related to muttering: grumbly
v. mut·tered, mut·ter·ing, mut·ters
1. To speak indistinctly in low tones.
2. To complain or grumble morosely.
To utter or say in low indistinct tones.
A low grumble or indistinct utterance.
[Middle English muttren, possibly from Latin muttīre.]
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|Noun||1.||muttering - a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech|
sound - the sudden occurrence of an audible event; "the sound awakened them"
|2.||muttering - a complaint uttered in a low and indistinct tone|
complaint - an expression of grievance or resentment