get the green light
To receive permission to proceed with some action or task. Likened to the green light of a traffic signal. We're just waiting to get the green light from our managers before we release the latest software update.
give somebody/get the ˌgreen ˈlight
(informal) allow somebody/be allowed to begin something: The council has given the green light for work to begin on the new shopping centre.As soon as we get the green light, we’ll start advertising for new staff.This expression refers to the green light on traffic lights, which means ‘go’.