a big fish in a small pond

Translations
большая рыба в маленьком пруду
He was a big fish in a small pond at his previous job.
Он был большой рыбой в маленьком пруду на своей предыдущей работе.
Definitions
A person who is important or influential in a small or limited environment but may not be as significant in a larger context.
Words
a

article or possessive pronoun
один
big

adjective
большой
fish

noun
рыба
in

preposition
в
a

article or possessive pronoun
один
small

adjective
маленький
pond

noun
пруд