green light

noun

A traffic light in its green state (indicating that vehicles may proceed). / (idiomatic) Approval, or permission to proceed.

The traffic signal turned green, allowing us to proceed.

意味（1）

A traffic light in its green state (indicating that vehicles may proceed).

The drive home was much faster than usual; somehow we managed to hit every green light.

意味（2）

(idiomatic) Approval, or permission to proceed.

We have a green light on the project. Work starts today.

意味（3）

(slang) A go-ahead to commit a crime, specifically to carry out a hit on someone (i.e. to kill).

Yo man, I heard someone had put a green light out on you, so watch your back.