To speak very quietly or in a whisper, often so others cannot hear. Usually refers to muttering complaints, criticisms, or comments meant to be private.
This phrase from the 17th century uses the metaphor of breath as the carrier of sound, suggesting that speaking 'under' one's breath means using so little air that the words barely escape. It originally described the technique of speaking with minimal breath to avoid detection.
The phrase captures the sneaky physics of quiet speech—when we mutter under our breath, we're literally using less air pressure to create sound, making our words hover just at the threshold of audibility. It's fascinating how this expression acknowledges that all speech is essentially controlled breath, and by controlling the breath, we control who can hear us.
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