Air out Definition 1 of 3Pro Tip 1/3Common Settings Use 'air out' when talking about refreshing homes, vehicles, or indoor areas. Please air out the classroom during the break. Pro Tip 2/3After Cleaning 'Air out' is often used after cleaning to remove chemical scents or dust. I've just cleaned the oven; it's time to air out the kitchen. Pro Tip 3/3Not for People Avoid using 'air out' to refer to giving people fresh air—it's for spaces and objects. We need to air out these old books, not the guests.