D-day
n
1 day (6 June 1944) on which the Allied forces landed in N France during the Second World War 第二次世界大战盟军在法国北部的登陆日(1944年6月6日).
2 date on which something important is due to happen 重大事件将要发生的日期
As D-day approached we still weren´t ready to move house. 日子快到了, 我们还没准备好搬家.