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
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