big cheese 重量级人物，大人物: an important person
I'm gonna go talk to the big cheese.
Dave thinks he's the big cheese.
He is a big cheese.
big fish 字面意思来讲就是大鱼的意思喔。
The old man tussled with the big fish.
1. N-COUNT If you 【describe someone as a big fish】, you believe that they are powerful or important in some way. 重要人物
The four men arrested were described as really big fish by the U.S. Drug Enforcement Agency.
2. PHRASE If you say that someone is 【a big fish in a small pond】, you mean that they are powerful or important but only within a small group of people. 小地方的大人物
In South Africa, Jani was a big fish in a small pond.
前两天还讲到了have bigger fish to fry 另有要事。大家还记得吗？^_^一起来复习一下吧。
Sorry I can't stay here. I have bigger fish to fry.
Tom asked me to go to a movie with him, but I told him I have bigger fish to fry.