What is an "airing cupboard"?

An airing cupboard is a small closet or cupboard, usually found in a bathroom or bedroom, used to store and air out freshly washed or damp clothes and linens. It is equipped with shelves or racks and a heater to dry the clothes and linens by circulating warm air. The warm air is usually provided by the central heating system of the house or through a separate heater built into the cupboard. The airing cupboard is also used to store towels and bed linens, keeping them warm and fresh, and to dry wet shoes or boots. It is a convenient storage solution for keeping clothes and linens organized, fresh, and ready to use.