closing button
nounUK /ˈkləʊzɪŋ ˈbʌtən/
US /ˈkloʊzɪŋ ˈbʌtən/
A small button you press to shut a window or a door.
Press the closing button to shut the car window.
OTHER MEANINGS
2. A button on a screen that makes a window or program go away.
Click the closing button in the corner to close the app.
3. A button that makes an elevator door shut.
She pressed the closing button so the elevator doors would close faster.
4. A button that ends a call or a session.
Tap the closing button when you finish the video call.