verb · to initiate or unleash an action, attack, or large-scale project

军队对敌人发动了突然袭击。

verb, adverb · to start or set in motion, especially an engine or machine

司机发动了汽车引擎。

verb · to organize or arouse people to take part in an activity or movement

学校发动全校师生为灾区捐款。