（1）All night long: 整夜
Some stores stay open all night long.
（2）Call it a day: 一天工作完毕
Every day, we have class from 9am and will call it a day at 4.30pm.
（3）Day after day: 每天
Schooling could be very boring, as the students do the same things day after day.
（4）Day in day out: 一天又一天
Henry wears the same old jeans day in day out. Isn't he going to buy some new clothes ?
（5）For a rainy day: 为困难的日子作准备
When a person gets older, he will realise the importance of saving for a rainy day.
（6）In this day and age: 在现在这时代
In this day and age, no one can expect to get something out of nothing.
（7）Have an off day: 不大成功或顺利的一天
Tom did not do well in yesterday's test.He considered him unlucky euough to have an off day.
（8）The order of the day: 一般的惯例
In a petroleum station here, payment by credit card is the order of the day.
（9）The other day: 几天前
I bumped into an old friend the other day.
（10）To this day: （指日期）准确地
It is 40 years to this day that I left university.
（11）Have seen better days: 曾经历过好日子
Palmer was departmental head in that university before he came here. He has seen better days.
（12）Some day: 将来
Everyone hopes to be great some day.
（13）One's days are numbered: 末日将临：
Under computerisation, unskilled workers become redundant. Their days in a company are numbered.
（14）Carry the day: 胜利的一天
Our team lost at first, but later, it carried the day with two goals to one.
（15）Someone's day: 幸运的一天
Jim was promoted. Furthermore, he was given a performance bonus yesterday. It was his day.
（16）Take a day off: 休息一天
Janet was unwell and took a day off.
（17）Have a night out: 夜间出去消遣
It's time to have a change. We must have a night out at the weekend.
（18）A night owl: 迟迟不睡者
The moment Jack entered the university, he was a night owl.
（19）At the dead of night: 深夜
Our managerial officers attended the emergency meeting at the dead of night.
（20） Save the day: 使情况变佳.
Frank saved the day by kicking in a goal during the last five minutes of the match.
（21）Every dog has its day: 凡人都有得意日
I have seen ordinary people suddenly become important. This is a case of every dog has its day.
（22）What is done by night appears by day: 若要人不知，除非己莫为
Crime does not pay. Criminals will be found out. That's why we say : What is done by night appears by day.