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1
Q
back up
1.back 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?
2.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.
backup
1.extra help or support that you can get if necessary
The police had backup from the army.
We can use him as a backup if one of the other players drops out.
The hospital has a backup power supply.
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