Allow someone to start or proceed with something.
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To give someone permission to go ahead with a plan or project.
When you give someone the green light, you approve their idea and allow them to proceed.
It signals that all conditions have been met and the path is clear.
"Give the Go-Ahead"
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Authorizing something — nearly identical, but green light more often implies a formal approval
"Sign off on Something"
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Formally approving something as a final step, without necessarily freeing someone to proceed independently
"Give Someone the Green Light"
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Officially approving and permitting someone to move forward with something