Hi! I think it has to do with the movement; here is a switch. You switch "on" & "off" with a single "click".
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Hi!
I think it has to do with the movement; here is a switch. You switch "on" & "off" with a single "click".
When you turn something "on" or "off", it's a clockwise or counter clockwise movement, like in a dial.
"Turning someone on" also has a particular meaning, it's "arousing someone, sexually".