The word 毁掉 is a verb formed by combining the morpheme 毁 (huǐ), which means "to destroy" or "to damage", with the resultative complement 掉 (diào), which literally means "to fall" but here functions grammatically to indicate a completed action or a successful result of the preceding verb. Together, 毁掉 means "to destroy completely", where 毁 provides the core action of destruction and 掉 adds the nuance that the destruction is thorough, finished, or has resulted in something being gone or eliminated. This structure is a common pattern in modern Chinese for creating verbs that express a definitive outcome.