backdate
v [Tn] declare that (sth) is to be regarded as valid from some date in the past 宣布(某事物)自过去某日起即为有效
a pay increase awarded in June and backdated to 1 May 6月份发放的从5月1日算起的增薪.
🗣️ 情景例句
When would we have to move?
什么时候我们得搬家?
The classes are interesting, and the teachers are good.