Definition of "dimmer switch" []

• A light switch which can adjust the brightness of the switched lamp from dim to bright, as well as turning it on and off. (noun)
• A switch that changes the headlamps on a motor vehicle from low to high and from high to low beam; a high-beam switch; a brights switch. (noun)

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• "I slid my hand along the wall to the dimmer switch Neverman had played with two nights ago."