绿灯

綠燈
lǜdēng
  1. green light (traffic signal)
  2. (fig.) permission to proceed

CEDICT

Entry Composition

1 绿 lǜ
  1. green
  2. (slang) (derived from 绿帽子 lǜmàozi) to cheat on (one's spouse or boyfriend or girlfriend)
2 灯 dēng
  1. lamp
  2. light
  3. lantern

classifier: 盞