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English definition of “green light”

green light

noun [C]  /ˈɡrin ˈlɑɪt/ us  
a traffic signal with the green part lit as a signal that it is safe to go: Wait for the green light before crossing the street. fig. A green light is also permission to do something: The developers were given a green light to go forward with the project.
(Definition of green light from the Cambridge Academic Content Dictionary © Cambridge University Press)
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