0 past simple and past participle of switch
1 to use a switch to change a device from one state or type of operation to another:
switch the TV off/on
2 to change suddenly or completely, especially from one thing to another, or to exchange by replacing one person or thing with another:
By toggling this key, you can switch the italics on and off.
Could you switch on the radio?
The computer takes a few seconds to power up after it's been switched on.
We used to have oil-fired central heating, but now we've switched to gas.
