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backup

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noun backup pronunciation in American English /ˈbækˌʌp/ 
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singularbackup
pluralbackups
  1. 2
    [countable/uncountable] people or equipment that can be used when extra help is needed

    I've got my mother as a backup in case the babysitter cancels.

    They realized that Sykes was armed, and radioed for backup.

    a backup generator/crew

    Synonyms and related words for this sense of backup
  2. 3
    an increase in the amount of something that happens when its normal flow is stopped

    a backup in traffic

    a backup of sewage into a building

    Synonyms and related words for this sense of backup
  3. 4
    [uncountable] music music that is played or sung to add to the main singer's voice

    Her sister goes on tour with her and sings backup.

    a backup vocalist

    Synonyms and related words for this sense of backup

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