any of various lights required to be displayed by a vessel or aircraft operating between sunset and sunrise.
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- running gear,
- running hand,
- running head,
- running joke,
- running knot,
- running martingale,
- running mate,
- running myrtle,
- running on empty,
- running pine
Origin of running light
First recorded in 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
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