Very quietly so others can't hear.
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Said very quietly, almost in a whisper, so people nearby can't easily hear.
When someone speaks under their breath, they say something they don't want to be overheard — often a complaint, comment, or curse.
It implies suppressed emotion or discretion.
"Behind Someone's Back"
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Talking about someone when they're absent, not whispering near them
"Bite Your Tongue"
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Choosing not to say something at all — not saying it quietly
"Under Your Breath"
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Saying something very quietly so those nearby won't easily hear it