switch on
phrasal verbswitch off/on | switch something off/on
to turn a light, machine, etc. off/on by pressing a button or switch 關／開（電燈、機器等） Please switch the lights off as you leave. 離開的時候請關燈。 How do you switch this thing on? 這東西怎麽開？ The electricity has been switched off. 電已經切斷了。 We only switched on halfway through the programme. 節目進行到一半時，我們才開始播放。