go out (of) the window
US /ɡoʊ aʊt (əv) ðə ˈwɪndoʊ/
UK /ɡoʊ aʊt (əv) ðə ˈwɪndoʊ/
1.
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
:
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When the company started losing money, all their environmental policies went out of the window.
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All my good intentions went out of the window when I saw the cake.