back in the day
成語所屬單字day
back in the day — 慣用語
1. In the past, especially a time that is remembered fondly.
1.慣用語
釋義
當年；過去
In the past, especially a time that is remembered fondly.
例句
Back in the day, we used to play outside until dark.
My grandfather often talks about how cheap things were back in the day.