up on

Language: en

Meaning: (idiomatic,colloquial)Well-informedconcerning.The tour guide was certainlyup onhis history.1986,Aliens:Maybe you aren'tup oncurrent events, but we just got our asses kicked, pal2001June 24,Christopher John Farley, “The New Video Wizards”, inTime:Says Sigismondi: "I don't watch [MTV]. I'm really notup onwhat's trendy."2011August 25,William Grimes, “Casey Ribicoff, Senator’s Widow and a Style Leader, Dies at 88”, inNew York Times, retrieved3 January 2012:“She wasup oneverything,” said the biographer A. Scott Berg. “Not just the news but every play or film or book.”

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