in one breath
in a single breath

He would give and take almost in the very same breath.

All that thinking she did in a breath of time.

That much I learned in a breath or two of time.

He could not keep back the break that was in his breath.

And then, in the next breath, just as certainly, had said that he wanted her gone.

I don't see how you can speak of them in the same breath with this.

To get past them, all must die in the same breath.

Then in the next breath, it was time to go.

It was hard to get the words out in one breath.

She closed her eyes and pulled in a deep breath.