青あお信しん号ごう

noun

green traffic light

Literal traffic signal meaning; the green light that permits vehicles or pedestrians to proceed.

• 青あお信しん号ごうになったら渡わたりましょう。

  Let's cross when the light turns green.

noun

green light; go-ahead; permission to proceed

Idiomatic use: approval or permission to start something, often in business or project contexts.

• 上じょう司しからプロジェクトに青あお信しん号ごうが出でた。

  We got the green light from the boss for the project.