sigh

an utterance made by exhaling audibly

a sound like a person sighing

A deep and prolonged audible inspiration or respiration of air, as when fatigued or grieved; the act of sighing.

heave or utter a sigh; breathe deeply and heavily

utter with a sigh

To inhale a larger quantity of air than usual, and immediately expel it; to make a deep single audible respiration, especially as the result or involuntary expression of fatigue, exhaustion, grief, sorrow, or the like.

To exhale (the breath) in sighs.