The action of breathing in air or other substances through the nose or mouth into the lungs.
From 'inhale,' which combines the Latin prefix 'in-' (in) and 'halare' (to breathe). The '-ing' form marks it as a present participle, and the word became common in medical and scientific English in the 18th century.
Your breath is literally your life force—'halare' (to breathe) is the root of not just 'inhale' but 'exhale,' and even the word 'hale' (meaning healthy), showing how breathing became metaphorical for being alive and well.
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