I let him know, in a few words under my breath, that there is no love lost.

And then heard himself clearly for the first time, singing under his breath.

Over by the window, John was again reading under his breath.

"I was working on something else," she said under her breath.

And no thanks to you, he added under his breath.

But he said this under his breath and no one heard it.

He thought the words, or spoke them under his breath.

It's just as if they were talking to one another under their breath!

The last part was under her breath, just loud enough for me to hear.

And certainly not to you, she added under her breath.