big fish

柯林斯词典

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[非正式]
The four men arrested were described as really big fish by the U.S. Drug Enforcement Agency. 四名被逮捕的男子被美国缉毒局描述为非常重要的人物。
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[非正式] [v-link PHR]
In South Africa, Jani was a big fish in a small pond. 在南非，亚尼是当地的大人物。