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- a green traffic light giving permission to proceed（交通）绿灯。
1.1
- figurative permission to go ahead with a project〈喻〉绿灯, 许可, 准许：
the Secretary of State has given the green light for a wind-farm development.
国务大臣对一个风力发电场开发项目开了绿灯。
(green-light)with obj.
- chiefly N. Amer. give permission to go ahead with (a project, especially a film)〈主北美〉批准（工程项目, 尤指影片）, 给…开绿灯。