Another theory suggests that "quid" originated from the Old English word "cwyd," which means "a bit of something" or "a small amount." Over time, "cwyd" may have been shortened to "quid" and came to be associated with the pound.
Some historians believe that the term "quid" may also have been influenced by the Irish word "quidditch," which means "a small sum of money." Irish immigrants brought the word "quidditch" to Britain during the 17th and 18th centuries, and it eventually may have been shortened and adapted to become "quid" in reference to the pound.
Lastly, another possible origin of "quid" is from the Roman slang word "quidus," which means "worthless" or "useless." This theory suggests that the term "quid" may have been used ironically to refer to the pound, particularly during periods of economic difficulty.
While the precise origin of the term "quid" is not entirely clear, it has become a widely used and colloquial expression for the British pound.