common device in cars and bikes used to
kill the engine when all else fails.
its also a term refering to the switch electrocutioners hit when a person is in "the chair".
times up, its 12 o' clock, say your prayers...hit the "kill switch".
A kill switch, every doomsday machine has one, I guess. It's the last resort off button, and a huge plot device. Robot going crazy? Kill switch. Inator foiled by a teal platypus? Kill switch. Machine gains sentience and greatly dislikes it? Kill switch. It's that easy!
"Bro, help! My vacuum is turning on me and becoming evil!"
"Does it have a kill switch?"
"Uh... no?"
"It was nice knowing you."