dimmer switch
US /ˈdɪm.ər ˌswɪtʃ/
UK /ˈdɪm.ər ˌswɪtʃ/
1.
a switch that controls the brightness of a light by varying the voltage or current
:
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Can you turn down the lights using the dimmer switch?
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The new lamp came with a built-in dimmer switch.