switch noun definition in How machines work topic from the Oxford Advanced Learner's Dictionary

switch

 noun: How machines work topic
a small device that you press or move up and down in order to turn a light or piece of electrical equipment on and off a light switch an on-off switch That was in the days before electricity was available at the flick of a switch. Which switch do I press to turn it off? to throw a switch (= to move a large switch)

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