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English definition of “Uncle Sam”

Uncle Sam

noun [S not after the]     /ˌʌŋ.kl̩ˈsæm/ informal
the US, or its government , sometimes represented by an image of a tall , thin man with a white beard and a tall hat United States politics and governmentCountry namesCountry and nationContinents and regions of the world
(Definition of Uncle Sam noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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