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backup

back·up

backup

 
pronunciation:
baek uhp
parts of speech:
noun, adjective
part of speech: noun
definition 1: an alternate, substitute, or copy kept in reserve.
With that damage to her hard drive, it's lucky she created a backup for the document she was working on.
definition 2: an accumulation or overflow caused by a blockage.
a backup in traffica sewage backup
 
part of speech: adjective
definition 1: acting as a reserve; extra.
a backup baby-sitter
similar words:
reserve
definition 2: accompanying, as musicians.
the singer and her backup band