green light

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green light

1. verb To permit someone or something to proceed. Likened to the green light of a traffic signal. Do you think the production company will green light our film?
2. noun Permission to proceed with some action or task. We're just waiting to get the green light from our managers before we release the latest software update.
See also: green, light
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

green light, the

Permission to go ahead, as in The chief gave us the green light for starting this project. This term originated in the late 1800s for the signal used by railroads to indicate that a train could proceed. It was transferred to more general use in the first half of the 1900s.
See also: green
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

green light

permission to go ahead with a project.
The green light referred to is the traffic signal indicating that traffic is free to move forward. Red and green lights were in use from the late 19th century in railway signals, but this figurative use of green light appears to date from the mid 20th century.
1997 New Scientist Zemin even got the green light to buy nuclear power plants.
See also: green, light
Farlex Partner Idioms Dictionary © Farlex 2017

green light

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.
See also: green, light
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
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References in periodicals archive ?
How much is there to know about green lighting? A book's worth, as it turns out.
They are investing in green lighting solutions for their buildings to save energy, and in effect, save money.
Some have turned to a host of energy-efficient technologies falling under the banner of green lighting to ease the pain on their pocketbooks.
Fluorescent lamps are another green lighting option.
For other green lighting technologies, the return on investment varies.
Cost savings aren't the only benefits managers and tenants will likely see as a result of green lighting solutions.
Steege said green lighting makes RenewAire an aesthetically pleasant place to work, and visitors always comment on how bright and welcoming the building looks.
Lusk pointed to a market research study facilitated by Lighting Science Group to demonstrate the positive effects of green lighting.
Drawbacks of course do exist to implementing green lighting at a property.
Disposal of green lighting technologies can be another drawback for real estate managers.
Another challenge with green lighting technology is its continual evolution and decreasing price, which makes purchasing decisions difficult.