switch
US /swɪtʃ/
UK /swɪtʃ/

1.
2.
a sudden or complete change, especially of one thing for another
:
•
There was a sudden switch in the weather.
•
The company made a switch to renewable energy.
1.
2.
to turn an electrical device on or off
:
•
Please switch off the lights when you leave.
•
He switched on the radio to listen to the news.