Definitions for up on
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Princeton's WordNet
abreast(p), au courant, au fait, up on(p)(adj)
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"
Wiktionary
up on(Adjective)
Well-informed concerning.
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