little frog in a big pond
little frog in a big pond or small frog in a big pond {n. phr.}
An unimportant person in a large group or organization.
In a large company, even a fairly successful man is likely to feel like a little frog in a big pond.
When Bill transferred to a larger high school, he found himself a small frog in a big pond.
Contrast: BIG FROG IN A SMALL POND.
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Source: A Dictionary of American Idioms
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