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Meaning of green light

green' light'

Pronunciation: [key]
  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'

Pronunciation: [key]
— -light•edor-lit, -light•ing.
  1. to give permission to proceed or authorization to (a project or person).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.