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|present participle||backing up|
|past tense||backed up|
|past participle||backed up|
If I ask for more money will you back me up?
Traffic is backing up on all out-of-town routes.
Cars were backed up for miles.
See if you can back up a bit further.
I’ll back the car up the driveway.
Back up: didn’t you say they had already met?
This is the British English definition of back up. View American English definition of back up.