短语 dawn on 的意思是某人终于明白一事。

例句

It dawned on me that I hadn't been sick for two years.

It was several hours before the truth finally dawned on Michael: he was in the wrong city.

请注意

另一个短语 the crack of dawn 的意思是黎明，破晓。

We have to leave tomorrow at the crack of dawn. Try to get some sleep.

Everyone woke up at the crack of dawn on Christmas morning. They wanted to see what presents they had been given.