If a system backs up, or if it is backed up, it has slowed down or stopped working because there is too much of something for it to deal with
If a toilet, sink, or drain backs up, or if it is backed up, water cannot flow through it because something is blocking it
If traffic backs up, or if it is backed up, the vehicles are in a long line and waiting to continue moving
To give support to someone by telling other people that you agree with them
To make a car go backwards
To make a copy of information on your computer
To move backwards a short distance
To show that an explanation or belief is probably true
Used for telling someone to return to something that was said earlier
All the evidence backs up her story.
Back up: didn’t you say they had already met?
Cars were backed up for miles.
I need everyone to back up about 10 paces.
If I ask for more money will you back me up?
I’ll back the car up the driveway.
Orders are really backed up this month.
See if you can back up a bit further.
The notion that our southern friends take more risks seems to be backed up by the statistics.
There are fears that stinking sewage may back up into homes and businesses.
Traffic is backing up on all out-of-town routes.
Backs up
Backing up
Backed up
There is no origin for this phrasal verb
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