go out (of) the window
US /ɡoʊ aʊt (əv) ðə ˈwɪndoʊ/
UK /ɡoʊ aʊt (əv) ðə ˈwɪndoʊ/

1.
窓の外に消え去る, なくなる
if something such as a quality, principle, or idea goes out of the window, it no longer exists or is no longer paid attention to
:
•
When the company started losing money, all their environmental policies went out of the window.
会社が赤字になり始めると、環境政策はすべて窓の外に消え去った。
•
All my good intentions went out of the window when I saw the cake.
ケーキを見たとき、私の良い意図はすべて窓の外に消え去った。