a controlling switch over the actions within an entire electrical or fuel system, esp. one that can break the main supply in emergency situations
This can be obviated by a master switch controlling the top floor, which can be in charge of one of the head servants.
He threw the master switch and a roaring burst of power poured into the main tubes.
He closed the master switch and turned to look at the smiling faces of Mr. and Mrs. Hill.
He made two delicate adjustments, threw a master switch and swung around.
Admittedly feeling better, Tom turned to the master switch and found it missing.
A man was on duty at a master switch—he would flood the camp with light at the rifle's first crack.
Tom watched the pressure needle rise slowly in front of him and finally reached out and gripped the master switch.
Seconds later the giant shock absorbers crunched on the ramp and Tom closed the master switch cutting all power.
Then, checking the Polaris and cutting all power, Connel removed the master switch and hid it.
One of the policemen took Verkan Vall's place at the control desk and threw the master switch, after checking the instruments.