dimmer switch
noun/ˈdɪmə swɪtʃ/
/ˈdɪmər swɪtʃ/
(also dimmer)
- a switch that allows you to make an electric light brighter or less bright
调光器；调光开关；亮度调节开关 - (North American English) (British English dip switch)a switch that allows you to make the front lights on a car point downwards
（汽车的）前灯变光开关