out the window prepositional phrase2 •(informal) Made obsolete; altered drastically as a result of situational change.Women can run, blacks can run, all sorts of people can run. We didn't think people like that could win in years past. That conventional wisdom is out the window now. That's good news. — 1990 •(informal) Gone; departed; disappeared.Life had gone out the window and scampered off. — 2011
