Up On Meaning
(idiomatic) Well-informed concerning.
Example: The tour guide was certainly up on his history.
2001 June 24, Christopher John Farley, "The New Video Wizards," Time:
Says Sigismondi: "I don't watch [MTV]. I'm really not up on what's trendy."
2011 Aug. 25, William Grimes, "Casey Ribicoff, Senator’s Widow and a Style Leader, Dies at 88," New York Times (retrieved 3 Jan 2012):
“She was up on everything,†said the biographer A. Scott Berg. “Not just the news but every play or film or book.â€
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