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running light

noun

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

running light

noun

  1. nautical one of several white, red, or green lights displayed by vessels operating at night
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of running light1

First recorded in 1880–85

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running knotrunning mate

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