Definitions from Wiktionary (greenback)

▸ noun:  (US) Any bill that is legal tender in the US (originally printed with green and black ink) issued by the Federal Reserve.
▸ noun:  The United States dollar.
▸ noun:  (historical) A unit of American currency issued during the Civil War by the Treasury Department.
▸ noun:  (surfing) A wave that has not yet begun to break.
▸ Also see greenback

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