on/upon [phrasal verb] [T] - to visit (someone) or arrive (somewhere) suddenly, without warning, or without being invitedSorry to descend on you like this, but we had no time to phone.The police descended on the house in the early morning and caught the whole gang.(figurative) A feeling of despair descended upon (= was felt by) us as we realized that we were completely lost.(figurative) Silence descended on the room (= The people in the room became quiet).
DESCEND
Meaning of DESCEND in English
Cambridge English vocab. Кембриджский английский словарь. 2012