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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?
Cars were backed up for miles.
Traffic is backing up on all routes out of town.
See if you can back up a little farther.
I’ll back the car up the driveway.
Back up: didn’t you say they had already met?
This is the American English definition of back up. View British English definition of back up.