under one's breath

šeptem, potichu

He whispered under his breath. “I am sorry, I can´t go on with this anymore.” (Google)

He lifted his head to look around the office, and cursed under his breath at his own arrogance and stupidity. (Google)

Uncle Len said something under his breath. I could not hear what it was but I knew it was something bad about his sister. (Google)

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