panicbutton
nounUK /ˈpænɪk ˌbʌtən/
US /ˈpænɪk ˌbʌtən/
A panic button is a special button you press to call for help fast when you feel scared or in danger.
The teacher told us to press the panic button if there is ever an emergency in the classroom.
OTHER MEANINGS
2. A button on a computer or app that quickly hides or locks what you are doing.
She clicked the panic button on the website to hide her screen.
3. A button in a game that makes your character run away or reset.
When the monster appeared, he hit the panic button and restarted the level.
4. A button that stops a machine right away if something goes wrong.
The worker pressed the panic button to stop the conveyor belt.