* Originating from Latin: The word "quid" likely comes from the Latin word "quid pro quo," meaning "something for something" or "this for that."
* Evolution in usage: Over time, "quid pro quo" was shortened to "quid," and it became associated with the value of something exchanged, particularly in the context of money.
* 17th century evidence: One of the earliest documented uses of "quid" as a slang term for money was in the 17th century, suggesting it was already in common usage.
Therefore, the term "quid" likely evolved from the Latin phrase "quid pro quo," gradually transforming into a slang term for a British pound sterling as a measure of monetary value.
Interestingly, while "quid" is most commonly associated with the British pound, it's also used in other parts of the world, such as Ireland and Australia, to refer to their local currencies.