. The boss gave them the green light to order all the equipment they needed.
This expression comes from the green light on a stop light, which indicates that cars can move forward.Synonym: give/get (someone) the go-ahead.
20. Golden age a time when something is at its best
The 1930s were thegolden ageof radio, when everyone gathered around in the evenings to listen. After television took over, radio became secondary.
. The golden age of American literature began at the turn of the 20th century.
The expression is usually used to refer to the past.