Up on has 2 different meanings across 1 category:
Adjective
Adjective
1
being up to particular standard or level especially in being up to date in knowledge
"kept abreast of the latest developments"
"constant revision keeps the book au courant"
"always au fait on the latest events"
"up on the news"
2
Well-informed concerning.
Example Sentences
"kept abreast of the latest developments"
adjective
"constant revision keeps the book au courant"
adjective
"always au fait on the latest events"
adjective
"up on the news"
adjective