Definition of low beams noun from the Oxford Advanced American Dictionary

 

low beams

 noun
noun
 
[plural]
 
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  • the lights on a car when they are pointing down at the road, not a long way ahead Use your low beams for city driving. compare high beams
  • Idioms
    on low beam
     
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    (of the lights on a car) pointing down at the road, not a long way ahead Always have your lights on low beam when another car is coming toward you.