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standby - definition and synonyms

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noun [countable]     standby pronunciation in British English
/ˈstæn(d)baɪ/
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singularstandby
pluralstandbys
  1. someone or something that is always available to be used if they are needed in a particular situation

    We’ve kept the old buggy as a standby in case the new one breaks.

    a standby diesel generator

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