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English definition of “green light”

green light

noun [C, usually singular]
 
 
permission to start doing something: the green light for sth They finally got the green light for their project.the green light to do sth The Commission gave us the green light to start negotiations. The best that investors can hope for is that the report will be seen as a green light for takeovers.
(Definition of green light noun from the Cambridge Business English Dictionary © Cambridge University Press)
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