If you switch off a light or other electrical device, you stop it working by operating a switch. She switched off the coffee-machine Glass parked the car and switched the engine off. = turn off
cause to stop operating by disengaging a switch; "Turn off the stereo, please"; "cut the engine"; "turn out the lights
If you switch off, you stop paying attention or stop thinking or worrying about something. You may find you've got so many things to think about that it's difficult to switch off
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