n. a banknote; a bill of paper money.
- Although only one-dollar bills have green backs in Canada, this term has been applied to all bills after the usage in the United States, where all bills have green backs.
- 1870  Subscription. Ten Shillings Sterling ($2.50) per annum; greenbacks, $3.
- 1903  (1913)  ". . . Here's your fifty," he went on, taking a roll of bills from his pocket, and counting out the coveted greenbacks.
- 1950  Smelly oil-lamps gleamed over hard-eyed men, their drinks and their notched guns, glinted on silver coins, flickered on greenbacks and on the red, black, blue, white and yellow of stacked chips and falling cards.