big frog in a small pond
big fish in a small pond
An important person in a small place or position; someone who is respected and honored in a small company, school, or city; a leader in a small group.
Важная или высокопоставленная персона, которая работает в маленькой группе или организации.
As company president, he had been a big frog in a small pond, but he was not so important as a new congressman in Washington.
He could get a job with a big company but he enjoys being a big fish in a small pond.
Он мог бы получить работу в большой компании, но ему нравится быть большой рыбой в маленьком пруду.