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English definition of “Uncle Sam”

Uncle Sam

noun [U]  /ˈʌŋ·kəl ˈsæm/ us  
the US, or a symbol for the US or its government that is pictured as a tall, thin man with a white beard (= hair on the face) and a tall hat wearing clothes colored like the American flag
(Definition of Uncle Sam from the Cambridge Academic Content Dictionary © Cambridge University Press)
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