running light

noun
any of various lights required to be displayed by a vessel or aircraft operating between sunset and sunrise.

Origin:
1880–85

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
running light
 
n
nautical one of several white, red, or green lights displayed by vessels operating at night

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The modification to the headlight system shall not interfere or cause any feedback with the existing daytime running light system.
In addition, the ship was running light because of all the fuel consumed during this cruise.
And then that's the mast headlight and then this is called the running light.
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