release button
nounUK /rɪˈliːs ˈbʌtən/
US /rɪˈliːs ˈbʌtən/
A button you press to let something go or open.
Press the release button to open the camera.
OTHER MEANINGS
2. A button that frees a trapped or locked part.
The seat belt release button was stuck.
3. A control that lets a spring or catch open.
He pushed the release button on the trap door.
4. A button that stops holding something in place.
The release button let the tray slide out.