●desˈcend on sb/sth ( desˈcend upon sb/sthmore formal) 1.to arrive somewhere, especially suddenly and unexpectedly and in large numbers突然涌到；大批到达◆Dozens of police descended on the building. 数十名警察突然进入这座大楼。◆ (humorous) My sister and her family are descending on us this weekend. 我妹妹一家这个周末要到我家来。2.to go towards sb/sth as if you are going to attack them/it逼近◆The mosquitoes descended on us as soon as night fell. 天一黑，蚊子就扑向我们。◆A large woman in a hat was descending on them. 一个戴帽子的高大女人向他们冲过来。[v + prep]