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Meaning of Uncle Sam

Un'cle Sam'

Pronunciation: [key]
  1. a personification of the government or people of the U.S.: represented as a tall, lean man with white chin whiskers, wearing a blue tailcoat, red-and-white-striped trousers, and a top hat with a band of stars.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.