A (originally detachable) second window attached on the exterior side of a window in climates with harsh winters, to add an insulating layer of still air between the outside and inside.

A prescheduled time when a system can be taken off-line for maintenance, if necessary.

plural of storm window

A large window on the street-side of a shop or restaurant

(chiefly of a seat in a restaurant) Next to the window overlooking the street

To decorate the window of a shop / To give something superficial attractiveness

A person who window-shops.

Having no windows, especially no external windows.

(idiomatic) The browsing of shop windows without any intention of buying.

present participle of window-shop