Sawbuck (noun)

1. Slang term for a $10 bill.
2. Slang term for a ten-dollar bill.

Origin:

Slang term for a $10 bill, thought to be derived from the resemblance of the roman numeral x (which represents 10) on a $10 bill to the x-shape of a sawbuck, a device used to hold wood while it is being sawed.

Examples:

1. Can you lend me a sawbuck until Friday?
2. I'll give you a sawbuck if you can solve this puzzle.
3. He pulled out a sawbuck to pay for his drink.
4. I only have a sawbuck on me, will that be enough?
5. The store only accepts cash and I only have a sawbuck.