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.
Dictionary.com Unabridged

green-light

verb (used with object), green-lighted or green-lit, green-lighting.
to give permission to proceed; authorize: The renovation project was green-lighted by the board of directors.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
green light
 
n
1.  a signal to go, esp a green traffic light
2.  permission to proceed with a project
 
vb , -lights, -lighting, -lighted
3.  to permit (a project, etc) to proceed

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Slang Dictionary

green light definition


  1. n.
    the signal to go ahead with something; the okay. (See also go-ahead; high sign.) : When we get the green light, we'll start.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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Example sentences
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.
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