breath
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9. A trace or suggestion.
10. A softly spoken sound; a whisper.
11. Linguistics. Exhalation of air without vibration of the vocal cords, as in the articulation of p and s.
in one breath or in the same breath
At or almost at the same time.
out of breath
Breathing with difficulty, as from exertion; gasping.
under (one's) breath
In a muted voice or whisper.
[Middle English breth, from Old English brǣth.]