alt-tab

verb1

1. •
   To switch windows in Microsoft Windows.

noun2

1. •
   A keyboard shortcut in Windows that switches between application-level windows, sorted by most recently active.
2. •
   (informal) An equivalent keyboard shortcut that switches between windows or applications, such as Windows-Tab, or Command-Tab on macOS.

verb1

1. •
   To switch between windows or applications by pressing Alt-Tab (or equivalent).

   • If I Alt-Tabbed through all other open programs, eventually returning to the screen from which the cursor disappeared, it would reappear and everything seemed fine. — 1996