Homonym: green light (Approval)
"Green light" often refers to a signal that indicates it's safe to proceed. In traffic signals, a green light means drivers can go, while pedestrians can cross the street. This color is universally associated with safety and permission, making it an essential part of road safety.
In a broader context, "green light" can also symbolize approval or encouragement in various situations. For example, when someone receives a "green light" for a project at work, it means they have the go-ahead to start. This concept can apply to many areas of life, from personal decisions to creative endeavors, like art or writing.