Bucks

Where "Bucks" Comes From

The use of "buck" for a dollar — and by extension "bucks" for dollars — is American in origin. The most widely accepted explanation traces it to the North American frontier economy, where buckskins (deer hides) were a common unit of trade between European settlers and Indigenous peoples. A journal entry by Pennsylvania Dutch pioneer Conrad Weiser in 1748 records whiskey being valued at "5 bucks" — one of the earliest documented uses of the term as currency. When the United States adopted the dollar in 1792, "buck" transferred naturally to the new unit.

Australia adopted "bucks" as a casual term for dollars after decimalisation in 1966, when the Australian pound was replaced by the Australian dollar. The word arrived through the currency of American English rather than as a direct adaptation of the frontier trade sense. Today "bucks" in Australian English means dollars with no connection to the frontier origin — it is simply the informal word for money, used from pub conversations to property listings. The phrase "a few bucks" is as natural in Sydney as in New York, its American origin entirely invisible.

Source:

• Britannica — “Why Is a Dollar Called a Buck?”