Definition from macmillandictionary.com
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a light switch
an on-off switch
He flicked the intercom switch to his secretary.
Lily pressed the switch and plunged the room into darkness.
a major policy switch by Washington
He said the switch from electric to solar power would be made soon.
A switch to a high-fibre diet will help your digestion.
Last year he made the switch to boxing from kickboxing.