Uncle Sam
noun [ S not after the ] informal uk/ˌʌŋ.kəl ˈsæm/ us/ˌʌŋ.kəl ˈsæm/
山姆大叔（指美国或美国政府，有时以一个留白须、头戴高礼帽的瘦高个男子的形象出现，尤见于政治漫画中）
the US, or its government, sometimes represented by an image of a tall, thin man with a white beard and a tall hat