ㄅㄨˋㄍㄨㄥgōngˋㄆㄛˋ

  1. 不待對方攻擊自己內部矛盾自行瓦解·紅拂記·二四》:今日只合平世脣亡齒寒不攻自破。」封神演義·》:糧道使百姓不能接濟不攻自破。」至當不移

(of a rumor etc)​ to collapse (in the light of facts etc)​, to be discredited