cast downWiktionary 原文构词拆分cast词根/词干+down词根/词干演变路径（由近及远）英语继承自 ←中古英语 casten doun词源说明From Middle English casten doun, casten adoun, equivalent to cast + down.释义（英文）动词 Verb(transitive) To make (a person) discouraged or dejected.(transitive) To overthrow, to defeat or bring to ruin.Used other than figuratively or idiomatically: see cast, down.词族相关词（2）downcastthrow down