the big enchilada idiom
mainly US informal最重要的人（或事）
the most important person or thing
Clinton was the big enchilada, so everyone wanted to know what she thought. 克林顿是当时最重要的人物，每个人都渴望知道她的想法。
When it comes to environmental issues, the big enchilada is carbon dioxide. 环境议题中最重要的是二氧化碳。