sell downWiktionary 原文英美sell down1词源 1构词拆解sell词干+down词干词源说明From sell + down.释义动词verb1(intransitive, UK, business) To become less by being sold.2(transitive, UK, business) To reduce by selling.同族词派生词 1selldown相关词 3sell off#Verb·sell out#Verb·sell down2词源 2词源说明Shortening of sell down the river释义动词verb1idiomaticTo betray a person; to conspire against someone for personal gain.