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English definition of “Uncle Sam”

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Uncle Sam

noun [S not after the] uk   /ˌʌŋ.kl̩ˈsæm/ informal us  
the US, or its government, sometimes represented by an image of a tall, thin man with a white beard and a tall hat
(Definition of Uncle Sam from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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