to switch off; to turn off a device or power. Figuratively, to 'switch off' mentally or stop focusing.
部屋の電気のスイッチを切るのを忘れないでください。
Please don't forget to turn off the light switch in the room.
出かける前に必ずコンピューターのスイッチを切る。
Make sure to switch off the computer before going out.
仕事のスイッチを切るのは、休日にしっかり休むために大切だ。
Turning off the 'work switch' is important to properly rest on days off.