stopbutton

noun
UK /ˈstɒpˌbʌtən/
US /ˈstɑːpˌbʌtən/

A stop button is a button you press to make a machine stop.

Press the stop button if the machine starts to shake.


OTHER MEANINGS

2. A button on a media player that ends playback.

She hit the stop button when the movie got too scary.

3. A large red button used to halt an escalator or conveyor in an emergency.

The worker pressed the stop button to halt the conveyor belt.

4. A software control that cancels a running process.

Click the stop button to cancel the download.

5. A button that ends a timer or stopwatch.

He tapped the stop button as he crossed the finish line.