under sb`s breath

pod vousy, pro sebe (mumlat si)

When the teacher asks questions, I often answer under my breath.(W.Magnuson,Eng.Idioms)

He left in an angry mood, muttering and swearing under his breath. (English Idioms, Oxford)

I muttered under my breath as Taff pulled out the cork and commenced pouring the wine into the two mugs.(BNC)

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