To speak in a low, indistinct voice, often in a complaining or discontented manner. To grumble or speak unclearly under one's breath.
From Middle English 'moteren,' possibly imitative of the sound of low, unclear speech. Related to Middle Low German 'muteren' and Old Norse 'muðra.' The word has maintained its onomatopoetic quality, mimicking the actual sound it describes.
Muttering is the vocal equivalent of passive aggression - it allows us to express discontent while maintaining plausible deniability about what we actually said. This form of semi-secret speech serves as a social pressure valve, letting frustration escape without direct confrontation.
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