back up
phrasal verbback up | back something up
- to move backwards, especially in a vehicle
- You can back up another two feet or so.
- I backed the car up to the door.
- Can you back your car up so that I can get through?
back somebody/something up
- to support somebody/something; to say that what somebody says, etc. is true
- I'll back you up if they don't believe you.
- The writer doesn't back up his opinions with examples.
- to provide support for somebody/something
- two doctors backed up by a team of nurses
- The rebels backed up their demands with threats.
back something up
- (computing) to prepare a second copy of a file, program, etc. that can be used if the main one fails or needs extra support
- It's a good idea to back up your files.