一哄而起

Explanation: Without careful preparation and well organized, all of a sudden action. 　　Usage: Partial official; as predicate, object, attribute; containing derogatory, for people 　　Source: Qing Li Baojia, "Exposure," the local people moving up public anger, rushing headlong into action. " 　　Examples: However, there was not ~ the people, when they were falling behind, but because no agents just quickly disappeared, and later became the backbone. ★ Lu Xun "且介亭杂文 last series" Thesaurus:  in the wake, Yiying follow