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back·up  (b  k   p  ) KEY NOUN:
- A reserve or substitute.
- Computer Science A copy of a program or file that is stored separately from the original.
- Support or backing.
- Music A background accompaniment, as for a performer.
- An overflow or accumulation caused by clogging or by a stoppage: a backup in the sink; a backup of traffic at the drawbridge.
ADJECTIVE: - Extra; standby: a backup pilot.
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