“Getting the green light” is a slang expression that means to “be allowed to do something”. We all know that when we are driving a car on the road, a “green light” means “go” or “you can drive”. In life, getting the “green light” means “getting permission”.
Here is a real life example:
I really want to take a long holiday this year. I’m all ready to go. I am just waiting for the green light from my boss.
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