绿灯

词典解释：◎绿灯lǜdēng(1)[greenlight]∶在交叉路口指示车辆可以通行的绿色信号灯光开绿灯(2)[permissiontogoaheadwithsomeproject]∶准予进行某事你尽管干吧,上面不会不开绿灯