Définitions
1.VerbTo move backwards, especially for a vehicle to do so."That beeping sound indicates that the truck is backing up."
2.VerbTo move a vehicle backwards."Back up the car a little, you're blocking the driveway."
3.VerbTo undo one's actions."I couldn't see how to finish the project, so I backed up and tried it another way."
4.VerbTo reconsider one's thoughts."This isn't working. Let's back up and think about it."
5.VerbTo copy (data) so that it can be restored if the main copy is lost."Back up your documents folder before applying the update."
6.VerbTo provide support or the promise of support to."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."
7.VerbFor the non-striker to take a few steps down the pitch, in preparation to taking a run, just as the bowler bowls the ball.
8.VerbFor a fielder to position himself behind the wicket (relative to a team-mate who is throwing the ball at the wicket) so as to stop the ball, and prevent overthrows.
9.VerbTo halt the flow or movement of something."When I flushed the toilet, the plumbing backed up and burst."
10.VerbTo fill up because of a backlog.
11.VerbTo run a printing press in reverse.
12.VerbIf a property backs up to another property, that means it abuts or shares a border with another property."We bought this house specifically because it backs up to our son's school."