B1
a switch that you press to control a piece of equipment
Dictionary examples:
The alarm clock has a snooze button that actually makes you late! (0.0)
I pressed the 'coffee' button, but the machine gave me soup! (0.0)
The microwave has a button that can heat up your homework excuses! (0.0)
He inserted the DVD and pressed the "play" button. (68.4)