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Do You Know
Questions & Answers on General Knowledge.

Why is a ten-dollar bill called a “sawbuck”?
Among the many slang expressions for denominations of money are deuce, originally a mild curse of the devil when the number two showed up in dice or cards, and the Yiddish fin for a five. Sawbuck for a ten comes from the frame of a sawbuck, or sawhorse, on which farmers held logs to be cut into firewood. This frame rested on two X-shaped supports that resembled the two roman numerals for ten found on the early American ten-dollar bill.
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