be up on

listen to the pronunciation of be up on
English - English
be well-versed in
up on
well-informed about

The tour guide was certainly up on his history.

be on
appear in a show, on T V , radio, etc ; "The news won't be on tonight"
up on
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"
be up on
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