1. a person or thing that dims.
  2. Also called dimmer switch. a rheostat or similar device by which the intensity of an electric light may be varied.
  3. dimmers,
    1. the low-beam headlights of an automobile or truck.
    2. the small, parking lights of an automobile.


  1. a device, such as a rheostat, for varying the current through an electric light and thus changing the illumination
  2. (often plural) US
    1. a dipped headlight on a road vehicle
    2. a parking light on a car

1822, agent noun from dim (v.). Of mechanisms for reducing the brightness of electric lights, from 1905.

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