1. 在整个夜间；在夜里的某一时刻
If something happens overnight, it happens throughout the night or at some point during the night.
2. 突然；一下子；一夜之间
You can say that something happens overnight when it happens very quickly and unexpectedly.
3. 只供一两晚使用的
Overnight bags or clothes are ones that you take when you go and stay somewhere for one or two nights.
4. 过夜
If you overnight somewhere, you spend the night there.
1. 在整个夜间；在夜里的某一时刻
If something happens overnight, it happens throughout the night or at some point during the night.
e.g. The weather remained calm overnight...
整晚都悄然无风。
e.g. The decision was reached overnight...
决定是在夜里作出的。
2. 突然；一下子；一夜之间
You can say that something happens overnight when it happens very quickly and unexpectedly.
e.g. The rules are not going to change overnight...
这些规定不会说变就变。
e.g. He's realistic enough to know he's not going to succeed overnight...
他很现实，知道自己的成功不会一蹴而就。
3. 只供一两晚使用的
Overnight bags or clothes are ones that you take when you go and stay somewhere for one or two nights.
e.g. He realized he'd left his overnight bag at Mary's house.
他意识到自己把过夜包落在玛丽家了。
4. 过夜
If you overnight somewhere, you spend the night there.
e.g. They had told her she would be overnighting in Sydney.
他们跟她说过她将在悉尼过夜。
overnight 情景对话
At the Airport-(在机场)
A：Is the nine o'clock flight from Montreal on time?
九点钟从蒙特利尔来的一班飞机是否准时到达？
B：Flight 496? No, it's running twenty minutes behind.They're due on the field at nine twentyfive. Probably Gate 34.
是496航班吗？不，它晚点二十分钟。 应该在九点二十五分着陆，大概是34号门。
overnight
A：I have reservations on Flight 27 to Mexico City.
我预订了27航班去墨西哥城的票。
B：May I see your tickets, please? You confirmed your reservations?
可以看看您的机票吗？您有没有确认您的机票。
A：Yes, this afternoon.
是的，今天下午确认的。
overnight
B：Here we are, Mrs.Jonhnson. Do you have any baggage?
我们查到了，约翰逊夫人。您有行李吗？
A：No. Just this overnight case.
没有，只有这个随身带的旅行包。
B：Fine. Let's see, now. flight 27 is right on time.You'll be leaving from Gate 13 on the eastern concourse.
好，现在我们来看看。27航班准时起飞。您走东部通道，从13号门登机。
A：Is there anything else to do before flight time?
在起飞前还有什么手续要办吗？
B：No, ma'am. Just show your ticket to the boarding officer as you get on the plane. The rest is our job. Have a good trip, Mrs.Johnson.
没有，夫人。您登机时只要向工作人员出示机票就可以了。余下的是我们的事。祝您旅途愉快，约翰逊夫人。