a way of referring to the United States of America or the US government (sometimes shown as a tall man with a white beard and a tall hat)山姆大叔（指美国或美国政府，有时被塑造成有白胡子、戴大礼帽的高个子男人）- He owed $20 000 in tax to Uncle Sam.他欠美国政府 2 万美元税款。🔊🔊
CultureUncle Sam wears red, white and blue clothes and has stars on his tall hat. He was probably named after 'Uncle' Sam Wilson (1766-1854), who examined army supplies for the US government during the War of 1812. During both world wars, a picture of Uncle Sam appeared on posters telling young men that they should join the armed forces. More Like This Expressions with people’s namesExpressions with people’s names Word Originearly 19th cent.: said (from the time of the first recorded instances) to have arisen as an expansion of the letters US.