"U.S. dollar bill," 1862, so called from the time of their introduction, from green (adj.) + back (n.); bank paper money printed in green ink had been called this since 1778 (as opposed to redbacks, etc.).
权威例句
1. A wallet full of greenback is find on the train.
火车上发现有一个装满美钞的钱包.
2. If the greenback declines, China's government stands to lose a fortune.
如果美元下跌, 中国政府就会丢失财富.
3. The greenback is also suffering anxiety over US credit and mortgage markets.
此外,外界对于美国信贷和按揭市场的担忧也对美元产生了影响.
4. Against other gauges the greenback may still be overvalued.
用其他的标准度量,美元将仍然是高估的.
5. The yen slipped against the greenback , trading at 120.34, down 0.78 yen.