Alt-F4 noun 2verb 1forms 3 noun2 •A keyboard shortcut in Windows that completely closes the application or a focused window. •(Internet) An Internet meme involving novice users being tricked into closing applications. verb1 •(Internet) To close or exit (a window or application) by pressing Alt-F4. formsAlt-F4ed · Alt-F4ing · Alt-F4s
