◆a green light准许；批准；许可
Other countries are eagerly awaiting an American green light to lift the sanctions altogether.其他国家正在急切等待着美国的准许以彻底解除制裁。
to give sb a green light给某人开绿灯；许可某人做某事
The food industry was given a green light to extend the use of these chemicals.食品工业得到了扩大这些化学品使用范围的许可。