Crossword Genius

Over (4)

Ross

(Other definitions for upon that I've seen before include "Immediately after" , "On tope of" , "Au courant" , "Onto" , "mounted" .)

I've seen this clue in The Independent, The Wall Street Journal, the USA Today, The Telegraph, The New York Times, the Evening Standard, The Star Tribune, The Mirror, the Penny Press, the Canadiana, The Guardian and the LA Times.
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