What does Big cheese idiom means?

The idiom "big cheese" means the most important person in a group or organization. It's often used humorously to refer to someone in a position of power or authority, especially a boss or CEO.

Here are some examples:

* "The big cheese at the company just announced a new policy."

* "We need to get the big cheese on board with this idea."

* "I'm not sure if I can get a raise, the big cheese is a real tough negotiator."

The origin of the idiom is unclear, but it likely originated in the 19th century. One theory suggests that it comes from the practice of serving a large wheel of cheese at special events, with the "big cheese" being the most prestigious piece. Another theory suggests it's a corruption of the phrase "big chief," which was used to refer to the leader of a tribe.

Regardless of its origin, "big cheese" remains a widely used idiom that's understood by most English speakers.