Switch that completely de-energizes (or kills) a device. From early IBM PC's which had a Big Red Switch on the side connected to the main power feed.
It's out of control -- hit the Big Red Switch!!!!
by Anonymous March 30, 2003
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The main power switch, often on computer equipment but applicable to any piece of equipment. Used to stop the system when all other control inputs have failed, often because of a system crash or lockup.
Tech 1: "Buggeration, we have the Blue Screen Of Death yet again !"

Tech 2: "Shit. Give me a sec, I shall apply my digital extremity to the Big Red Reset Switch"

<Click>

<Click>

Tech 1: "Ok, it's rebooting now".
by eighth of seven February 06, 2010
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