Definition & Meaning of "up on something "

What is the origin of the idiom "up on something" and when to use it?

The idiom "up on something" likely derives from the idea of gaining a higher or more complete understanding of a particular subject or topic. The use of "up" in this context implies an increase in knowledge or familiarity. While the precise origin of this idiom is not documented, it has been in use in the English language since 19th century. This expression is used to convey a person's familiarity, knowledge, or awareness of a specific subject, topic, or issue. It indicates that someone is well-informed, educated, or experienced in that area.