a figure of a person that has a green light shining through it at traffic lights in Britain. The green man lights up when the traffic has stopped, to show people that it is safe to cross the road.
an image of a man surrounded by green plants, trees, etc. In Britain it is an old symbol of fertility (= the ability of people to have children, trees to produce fruit and the soil to produce crops). The Green Man is a common name for a pub.