reversing light 
noun British
A white light at the rear of a vehicle that comes on when the vehicle is reversing.The reversing light is a nice touch, and I for one thought that was the exhaust pipe until closer inspection revealed my error....
- An eyewitness said: ‘Her reversing lights came on and the back of her vehicle hit another car.’
- This cluster would also feature normal orange indicators and white reversing lights but which cannot be seen within the red tail light cluster when not in operation.
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