green light

noun
1.
a green-colored traffic light used to signal drivers, pedestrians, etc., that they may proceed.
2.
authorization; approval; permission:
The railroad has been given the green light on the proposed fare increase.

green-light

verb (used with object), green-lighted or green-lit, green-lighting.
1.
to give permission to proceed; authorize:
The renovation project was green-lighted by the board of directors.
Examples from the web for green light
  • People could read the newspaper by their crimson and green light.
  • As he sat in the gloomy lab, watching neural signals dance in green light across an oscilloscope, he noticed something strange.
  • So the only way to see a star as being green is for it to be only emitting green light.
  • These devices create coherent green light in a three step process.
  • Finally, the top layer sports a different type of conducting polymer that absorbs mostly blue and green light.
  • Instead of using three circles, the red light is now a triangle and the green light is a square.
  • No one will say exactly when the browser project got the official green light.
  • All the local governments around here have a green light for entrepreneurs, and they want investment.
  • To get energy, the large chlorophyll molecules absorb red and blue light from sunlight and reflect green light.
  • He hasn't exactly been a fantasy beast thus far, but he's got a green light to shoot and is playing heavy minutes.
British Dictionary definitions for green light

green light

noun
1.
a signal to go, esp a green traffic light
2.
permission to proceed with a project
verb (transitive) -lights, -lighting, -lighted
3.
to permit (a project, etc) to proceed
Slang definitions & phrases for green light

green-light

verb

To approve; sanction: Who in the world thought that Levinson's screenplay should be green-lighted? (1968+)