green light

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From the standard red-green color scheme used in traffic lights and railway signals.


green light ‎(plural green lights)

  1. A traffic light in its green state (indicating that vehicles may proceed).
    The drive home was much faster than usual; somehow we managed to hit every green light.
  2. (idiomatic) approval, or permission to proceed.
    We have a green light on the project. Work starts today.


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