01 v. i. To utter words indistinctly or with a low voice and lips partly closed; esp., to utter indistinct complaints or angry expressions; to grumb…
imp. & p. p.
Muttered; p. pr. & vb. n.
Muttering
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1.
To utter words indistinctly or with a low voice and lips partly closed; esp., to utter indistinct complaints or angry expressions; to grumble; to growl.“Wizards that peep, and that mutter.” — Is. viii. 19.“Meantime your filthy foreigner will stare, And mutter to himself.” — Dryden.
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2.
To sound with a low, rumbling noise.“Thick lightnings flash, the muttering thunder rolls.” — Pope.