back up

phrasal verbphr v

a) back somebody/something ↔ upPROVE to say or show that what someone is saying is true 证实某人的说法，为某人作证；证明某事

Jane would back me up if she were here.

要是简在这儿，她可以为我作证。

There’s no evidence to back up his accusations.

他的指控没有证据支持。

These theories have not been backed up by research.

这些理论尚未获得研究证实。

b) back somebody/something ↔ up to provide support or help for someone or something 支持[帮助]某人/某事

The plan’s success depends on how vigorously the UN will back it up with action.

这个计划成功与否，取决于联合国是否会积极采取行动予以支持。

The police officers are backed up by extra teams of people at the weekend.

到了周末，警察会有增派人员支援。

→ backup

c) TDto make a copy of information stored on a computer 〔在计算机上〕（给…）做备份

Make sure you back up.

你一定要做好备份。

back something ↔ up

These devices can back up the whole system.

这些装置可以为整个系统备份。

back something ↔ up onto something

5 Back all your files up onto floppy disks.

把你所有的文档都复制到软盘上去。

n Back all your files up onto a storage device or Cloud.

→ backup

d) TTC especially American EnglishAmE to make a vehicle move backwards 倒（车）

The truck stopped and then backed up.

卡车停下来，然后倒车。

back something ↔ up

I backed the car up a little.

我把汽车往后倒了一点。

e) BACK/BACKWARDSto move backwards 向后移动，往后退

Back up a bit so that everyone can see.

往后点让大家都能看得见。

→ backup

f) if traffic backs up, it forms a long line of vehicles that cannot move 〔车辆〕排起长队，堵塞

The traffic was starting to back up in both directions.

两个方向的车辆都开始排起了长龙。

g) if a toilet, sink etc backs up, it becomes blocked so that water cannot flow out of it 〔马桶、洗涤槽等〕堵塞

Examples from the Corpus

back up• The car stopped and then began to back up.• Back up a bit so that everyone can see.• Can you back up a few steps so that I can open the door?• Back the truck up a little more, will you?• Don't forget to back up all the new files you create.• When you write a history essay, you should back up all your points with facts.• I didn't back the document up and lost the whole lot.• Wright was accused of pretending to be injured, and this was backed up by video evidence.• Cindi backed up the car and stopped in front of the door.• They claim they can give us the best deal, but can they back this up with guarantees?

→ back up at back3(PHRASAL VERB)

back upChinese