where·up·on /ˈhwɛrəˌpɔn, ˈhwær, ˈwɛr, ˈwær, ˌpɑn/
 (ad.)於是;因此
 Where·up·on adv. Upon which; in consequence of which; after which.
    The townsmen mutinied and sent to Essex; whereupon he came thither.   --Clarendon.
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 whereupon
      adv 1: closely following and in consequence of which; "the Japanese
             refused to import U.S. made cellular phones whereupon
             the U.S. imposed strict tariffs on Japanese exports"
      2: upon which; "the rock whereupon she stood"
      3: in consequence of which; "this is a statement whereat the
         listeners may get angry" [syn: whereat]