This is when a crowd gathers to watch a person who has climbed to the top of a public building in order to kill themselves, and people in the crowd shout and jeer, "Get on with it! Go on and jump!"
这指的是人们聚集起来 围观那些爬上高层公共建筑顶楼 企图自杀的人， 而人群中时常冒出 “快点儿啊！”“跳下去啊！” 之类的叫嚷和嘲讽。