where ‧ u ‧ pon /ˌweərəˈpɒn $ ˈwerəpɑːn, -pɒːn/ BrE AmE conjunction
formal used when something happens immediately after something else, or as a result of something happening:
She refused to hand over her money, whereupon there was a fight.
where ‧ u ‧ pon /ˌweərəˈpɒn $ ˈwerəpɑːn, -pɒːn/ BrE AmE conjunction
formal used when something happens immediately after something else, or as a result of something happening:
She refused to hand over her money, whereupon there was a fight.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012