English

Definition of green light noun from the Oxford Advanced Learner's Dictionary

 

green light

 noun
noun
BrE
 
; NAmE
 
[singular]
 
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permission for a project, etc. to start or continue synonym go-ahead The government has decided to give the green light to the plan. The council is expected to give the green light to the move. The industry must not assume that this ruling means a green light to go on polluting our lakes and rivers.

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