TO SWITCH ON/OFF - [verb] to turn on an electric light or an electronic device/to turn off an electric light or an electronic device
Examples of use
Switch on the light, I won't find the keys in the dark!
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English speaking practise
Remember that if you don't use that word in English conversations or writing you'll forget it in a short time. So the best thing you can do to learn this word is just trying to use it in speaking or writing. Remember also that practise is the key to fluent english speaking.
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