Running-light

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
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