Usage Note
Marmonner suggests speaking in a low, indistinct voice, often out of irritation or embarrassment. It is close to marmonner entre ses dents ('to mutter under one's breath'). Related verbs include marmotter and grommeler, all conveying grumbling or indistinct speech.
Examples
"Il marmonnait quelque chose d'incompréhensible."
Natural Translation
He was muttering something incomprehensible.

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