Back-up definitions

The definition of back up means someone or something that is a substitute or reinforcement.

An example of back up is a second team of Navy Seals waiting to raid a compound if the primary team needs assistance.

noun
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Back up is defined as to walk, drive or move in reverse.

An example of back up is for a truck to move in reverse to line up with a loading bay.

verb
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Back up means to copy or save computer data on a location other than your main computer hard drive.

An example of back up is when you copy your pictures to a CD.

verb
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(idiomatic, intransitive) To move backwards, especially for a vehicle to do so.

That beeping sound indicates that the truck is backing up.

verb
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(idiomatic, intransitive) To undo one's actions.

I couldn't see how to finish the project, so I backed up and tried it another way.

verb
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A term used in the fixed-income market when prices fall and yields rise. Another use for this term occurs when an investor moves funds from a five-year note and puts them into a two-year note. This term is also used to refer to a market that reverses an upward trend and backs up.
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(idiomatic) To move a vehicle backwards.

Back up the car a little, you're blocking the driveway.

verb
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(idiomatic, intransitive) To reconsider one's thoughts.

This isn't working. Let's back up and think about it.

verb
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(idiomatic) To provide support or the promise of support.

You should be careful. This guy is backed up by the local gang.

When he said I wasn't there, I told him I was, and my buddy backed me up.

verb
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See backup.
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(idiomatic, computing) To copy (data) as a security measure.

Back up your documents folder before applying the update.

verb
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(idiomatic, intransitive, cricket) For the non-striker to take a few steps down the pitch, in preparation to taking a run, just as the bowler bowls the ball.
verb
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(idiomatic, intransitive, cricket) For a fielder to position himself behind the wicket (relative to a team-mate who is throwing the ball at the wicket) so as to stop the ball, and prevent overthrows.
verb
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(idiomatic, intransitive, of a blockage) To halt the flow or movement of something.

When I flushed the toilet, the plumbing backed up and burst.

verb
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