1
general::
Phrase(s): switch on
1. [for something] to turn itself on. • Exactly at midnight, the lights switched on. • The radio switched on early in the morning to wake us up. 2. Sl. [for someone] to become alert or excited. • The wild music made all the kids switch on and start to dance. • About midnight, Ed switches on and becomes a real devil., Phrase(s): switch something on
to close an electrical circuit that causes something to start functioning or operating. • Please switch the fan on. • I switched on the fan.
McGrawhill's American Idioms And Phrasal Verbs