green light

green light
noun
  1. a green traffic light giving permission to proceed
    (交通)绿灯
    ■(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.
    国务部长对一个风力发电场开发项目开了绿灯。
verb
  1. (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
英语宝典
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