Aeration

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Known as breathing. The wine begins to breathe, that is, it “opens” after contacting the air and thus releasing its odors and aromas.

Aeration (Wikipedia)

Aeration (also called aerification or aeriation) is the process by which air is circulated through, mixed with or dissolved in a liquid or other substances that act as a fluid (such as soil). Aeration processes create additional surface area in the mixture, allowing greater chemical or suspension reactions.