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Definition of backup light noun from the Oxford Advanced Learner's Dictionary

backup light

noun
 
/ˈbækʌp laɪt/
 
/ˈbækʌp laɪt/
(North American English)
(British English reversing light)
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  1. a white light at the back of a vehicle that comes on when the vehicle moves backwards
See backup light in the Oxford Advanced American Dictionary
Check pronunciation: backup light

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aspiration
noun
 
 
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