Back Up Meaning
(idiomatic, intransitive, of a blockage) To halt the flow or movement of something.
Example: That beeping sound indicates that the truck is backing up.‎
Back up the car a little, you're blocking the driveway.‎
1898, Winston Churchill, chapter 5, The Celebrity:
We expressed our readiness, and in ten minutes were in the station wagon, rolling rapidly down the long drive, for it was then after nine. […] As we reached the lodge we heard the whistle, and we backed up against one side of the platform as the train pulled up at the other.
I couldn't see how to finish the project, so I backed up and tried it another way.‎
This isn't working. Let's back up and think about it.‎
Back up your documents folder before applying the update.‎
You should be careful. This guy is backed up by the local gang.‎
When he said I wasn't there, I told him I was, and my buddy backed me up.‎
When I flushed the toilet, the plumbing backed up and burst.‎
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