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Phrase(s): a big frog in a small pond
an important person in the midst of less important people. (Alludes to a large frog that dominates a small pond with few challengers.) • I’d rather be a big frog in a small pond than the opposite. • The trouble with Tom is that he’s a big frog in a small pond. He needs more competition.
McGrawhill's American Idioms And Phrasal Verbs