aerate

(verb) expose to fresh air. Synonyms: air out, air. Example: "Aerate your old sneakers."

(verb) aerate (sewage) so as to favor the growth of organisms that decompose organic matter. Synonyms: activate.

(verb) impregnate, combine, or supply with oxygen. Synonyms: oxygenate, oxygenize, oxygenise. Example: "Oxygenate blood."