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 Canadiana, The New York Times, the LA Times, The Star Tribune, The Guardian, the Penny Press, The Wall Street Journal, The Independent, The Telegraph, the USA Today and the Evening Standard.
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