green light

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


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. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
green light
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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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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