green light

¹

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.

green-light

²

verb (used with object)

green-lighted, green-lit, green-lighting. 

1. to give permission to proceed; authorize.

   The renovation project was green-lighted by the board of directors.

green light

noun

1. a signal to go, esp a green traffic light

2. permission to proceed with a project

verb

1. to permit (a project, etc) to proceed

Related Words

• approval 
• assent 
• blessing 
• clearance 
• consent 
• go ahead 
• permission 
• seal of approval 
• thumbs-up