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| back up |
verb |
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| Definition: |
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1. transitive verb support somebody: to provide support for a person or idea
  I'm sure you'll back me up on this.
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2. transitive verb prove statement: to supply proof that a statement is true
Evidence of growth is backed up by recent economic statistics.
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3. transitive verb comput copy computer files: to make a copy of computer data to keep in case anything goes wrong with the original
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4. transitive and intransitive verb go backward: to go or move something backward
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5. transitive and intransitive verb accumulate: to build up, or cause something to build up, especially because normal flow is obstructed
Traffic was backed up three miles from the accident.
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