开绿灯 kāilǜdēng to give the green light Origin Definitions Defs Strokes Stroke Words Sentences Sents 开 開 kāi verb to operate to drive; to pilot; to operate (machinery); to turn on (a light, appliance, or water)绿灯 綠燈 lǜdēng noun green light 1. green traffic signal indicating that vehicles and pedestrians may proceed; 2. permission or authorization to proceed with a task or project