where·u·pon /ˌweərəˈpɒn $ ˈwerəpɑːn, -pɒːn/ conjunction IMMEDIATELYRESULT formal used when something happens immediately after something else, or as a result of something happening 马上;于是 She refused to hand over her money, whereupon there was a fight. 她拒绝交出她的钱,于是发生了争吵。
whereupon• The rioters headed downtown, whereupon they attacked city hall.