Every Saturday I’ll give you a couple of idioms to learn. An idiom is a saying or phrase whose meaning cannot be taken from the literal meanings of the words.
receive / give someone the green light: give the OK for a project or idea, allow to proceed.
Example:
I submitted a proposal last week to make some improvements to the production line, but we haven’t received the green light yet.
captain of industry: influential or knowledgeable person in the industry.
Example:
Henry Ford was a captain of the auto industry, and his innovations allowed cars to be built at a price many people could afford.