Sigh out

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Senior Member
India- hindi
how much air you can blow out in a relaxed manner, like a gentle sigh out until your lungs are completely empty.

Spirometry and reversibility testing
Is "sigh out" a phrasal verb and what does it mean and how is it different from just the verb "sigh"?
In other words, what meaning does "out" impart to the phrasal verb?
I just realised it must be a noun as it's preceded by "a gentle" but still how it is different from just normal noun "sigh"?
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