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Definition of dimmer switch noun from the Oxford Advanced Learner's Dictionary

dimmer switch

noun
 
/ˈdɪmə swɪtʃ/
 
/ˈdɪmər swɪtʃ/
(also dimmer)
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  1. a switch that allows you to make an electric light brighter or less bright
  2. (North American English)
    (British English dip switch)
    a switch that allows you to make the front lights on a car point downwards
See dimmer switch in the Oxford Advanced American Dictionary

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