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English definition of “traffic light”

traffic light

noun [C usually plural] uk   us  
A2 one of a set of red, yellow, and green lights that control the movement of vehicles, usually at a point where two or more roads join: The police pulled him over for failing to stop at a red traffic light. Turn left at the traffic lights. The traffic lights turned green as we approached the junction.
(Definition of traffic light from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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