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backup - definition and synonyms

 
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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
  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
  3. 4
    [uncountable] music music that is played or sung to add to the main singers voice
    Her sister goes on tour with her and sings backup.
    a backup vocalist
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