countdown

Từ điển Oxford Advanced Learner 8th

count·down [countdown countdowns] BrE [ˈkaʊntdaʊn] NAmE [ˈkaʊntdaʊn] noun ~ (to sth)
1. singular, uncountable the action of counting seconds backwards to zero, for example before a ↑spacecraft is launched
2. singular the period of time just before sth important happens
•the countdown to the wedding