Definition
Refers to the day that occurred two days prior to the current day.
前天
I ran into him at the library the day before yesterday.
我前天在图书馆遇到了他。
It rained heavily the day before yesterday, causing many streets to flood.
前天下大雨，导致许多街道淹水。
She completed an important report the day before yesterday.
她前天完成了一份重要的报告。