窓を開放する

The word '窓' (mado) means 'window'. It is a native Japanese word that has been in use for centuries. The 'ま' (ma) morpheme can be found in other words related to openings or spaces. The word '開放' (kaihō) is a Sino-Japanese word, composed of '開' (kai), meaning 'open', and '放' (hō), meaning 'release' or 'set free'. This compound word entered the Japanese language from Chinese. The 'する' (suru) at the end is a common Japanese verb suffix that turns a noun or an adjectival noun into a verb, meaning 'to do' or 'to make'. Therefore, '窓を開放する' literally translates to 'to do the opening and releasing of the window', which in natural English means 'to open a window completely to let air in'.