hiddenbutton
nounUK /ˈhɪd.ən ˈbʌt.ən/
US /ˈhɪd.ən ˈbʌt.ən/
A hidden button is a button you cannot see until you find it.
She pressed the hidden button and a secret door opened.
OTHER MEANINGS
2. A button in a computer program that is not shown on the screen but can still be clicked.
The game has a hidden button that gives you extra points.
3. A small button sewn inside clothing so it does not show.
The coat has a hidden button to keep it closed neatly.
4. A button on a machine placed where people do not notice it.
He found the hidden button under the desk that turned on the light.