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backup light

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noun

a light at the rear of a motor vehicle that lights as a warning to those behind.

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On the farm, the feed for chicks is significantly different from the roosters’; ______ not even comparable.
Also called backing light.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for backup light

back-up light

noun

US and Canadian a light on the rear of a motor vehicle to warn others that the vehicle is being reversedAlso called: reversing light
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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