backup

Meanings

1. 1
   noun

   A copy of computer files kept separately so you can recover them if the originals are lost.

   Always make a backup of your work in case your computer crashes.

2. 2
   noun

   Extra help or support, especially police officers sent to assist.

   The officer called for backup before approaching the building.

3. 3
   noun

   A person or thing kept ready to be used in place of another.

   If the goalkeeper gets injured, we have a backup ready to play.

4. 4
   noun

   A buildup of traffic or material caused by a blockage.

   The accident caused a long backup on the highway.

Common collocations

• backup plan Adjective + noun

Deverbal from back up.

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