Green-light meaning

The green-colored light that signals traffic to proceed.
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Permission to proceed.
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Permission or authorization to proceed with a proposed undertaking, as the project of making a film from a script that has been submitted.
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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.

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(idiomatic) Approval, or permission to proceed.

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

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Alternative spelling of greenlight.
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Origin of green-light

  • From the standard red-green color scheme used in traffic lights and railway signals.

    From Wiktionary