green light

Noun
  1. A signal to proceed (synset 106887441)
    is a type of: stoplight, traffic light, traffic signal - a visual signal to control the flow of traffic at intersections
    same as: go-ahead
  2. Permission to proceed with a project or to take action (synset 106702693)
    "the gave the green light for construction to begin"
    is a type of: permission - approval to do something

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