Where does the expression a crock come from?

The expression "a crock" is derived from the phrase "a crock of gold," which refers to a large amount of money or wealth. The term "crock" was originally used to describe a large earthenware vessel, and it was often used to store food or other valuable items. Over time, the phrase "a crock of gold" came to be associated with wealth and good fortune, and it eventually evolved into the expression "a crock" to describe something that is valuable or desirable.