low beam

noun
an automobile headlight beam providing short-range illumination of a road and intended chiefly for use in driving on the streets of cities, towns, etc.
Compare high beam.


Origin:
1945–50

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To low beam
WordNet
low beam

noun
the beam of a car's headlights that provides illumination for a short distance 
WordNet® 3.0, © 2006 by Princeton University.
Cite This Source
Example sentences
If a vehicle comes toward you with high beams on, switch to low beam and look
  to the right edge of the road.
For better visibility during these weather conditions, keep your vehicle's
  headlights on low beam.
The inspection is conducted using the low beam headlights.
However, if you must drive, then drive slowly and use your low beam headlights.
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