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"Switch it off" is what we say in America.
Student Switch Off's motto is 'SWITCH OFF - SAVE ENERGY - WIN PRIZES'.
Original Furbies do not have an On/Off switch. Emototronic Furbies have an On/Off switch on the bottom in between their feet.
(this should be a grammar question)
Switch off the light(s).
No, there is no on/off switch.