running light

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

1880–85 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
running light
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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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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