The phrase "window opening" refers to the action or process of opening a window, which means physically moving the window to let air or light come into a room. Full definition
The transfer window opens in just over a month now, so we are having a look at the latest rumours doing the rounds. (justarsenal.com)
29, It seems that experimenting is the best way to figure how to drive with windows open in a specific vehicle. (autoline.tv)
When tenants don't need to pay for their own heat, they tend to leave windows open in the winter or the air conditioner running 24/7 in the summer. (biggerpockets.com)