plummeterWiktionary 原文构词拆分plummet词根/词干+-er后缀(added to verbs) A person or thing that does an action indicated by the root verb; used to form an agent noun. · (added to verbs, informal) A person or thing to which the root verb is done or can be done satisfactorily.词源说明From plummet + -er.释义（英文）名词 NounOne who plummets.