To give something the green light 給予批準，開綠燈

　　在行車時綠燈表示通行。在其它情況下，如果說一個人給什么事或什么項目開了綠燈 to give something the green light 意思就是此人點頭同意了，批準了這件事情或這個項目。

　　例句

　　Great news. The landlord has given us the green light to choose our own flatmate.

　　I read that the university has given the green light for the new library project.

　　請注意

　　另一個含義相似的表達是 to get the green light，意思是尋求批準，得到同意。

　　例句

　　I’ve got the green light to take some extra time off to finish my essay.

　　If you want to go on the field trip you’ll have to get the green light from your parents.