count·down/`kantˏdan; ˈkaʊntdaʊn/ n [C, usually singular 一般用单数] 1 when numbers are counted backwards to zero before something happens 倒（读）数: countdown to take-off 发射前倒数 2 the period before an important event happens when it gets closer and closer 〔重要事件发生前的〕倒数计时: the countdown to the millennium 千禧年倒数计时