Taillight definitions

tāl'līt'
A red light or one of a pair mounted on the rear end of a vehicle.
noun
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A light, usually red, at the rear of a vehicle to warn vehicles coming from behind.
noun
7
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One of a pair of red lights, mounted on the rear of a vehicle, so it can be seen from the rear at night.
noun
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Origin of taillight

tail +"Ž light