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Definition of Uncle Sam noun from the Oxford Advanced American Dictionary

 

Uncle Sam

 noun
noun
NAmE//ˌʌŋkl ˈsæm//
 
(informal)
 
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a way of referring to the United States of America or the U.S. government (sometimes shown as a tall man with a white beard and a tall hat) He owed $20,000 in taxes to Uncle Sam.
See the Oxford Advanced Learner's Dictionary entry: Uncle Sam