noun
through a window; across a window
Describes an action or state done through or across a window, such as looking, talking, or passing something. Often used adverbially as 窓越しに.
窓越しに外の景色を眺めた。
I gazed at the scenery outside through the window.
隣の人と窓越しに話した。
I talked with my neighbor through the window.
Compound of 窓 (mado, 'window') and 越し (goshi, 'across, through'). The derivation is straightforward; 越し is a suffix-like element indicating an action performed across a barrier.