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Green light go is a term that originated in the late 1800s for the signal used by railroads to indicate that a train could proceed and later cars. It is also a general slang term that give permission for one to proceed with whatever they are doing. For example, a boss gives his or her employees the green light to go ahead and begin a project.
Green light, the. (n.d.). Retrieved from https://www.dictionary.com/browse/the-green-light