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mischief

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noun [uncountable] British English pronunciation: mischief /ˈmɪstʃɪf/
  1. behaviour or play, especially of children, that causes trouble but not serious harm to other people
    be up to/get up to mischief (=do something bad):

    The boys are always up to some mischief or other.

    get into mischief (=start behaving badly):

    He got into mischief the moment he left school.

    keep (someone) out of mischief (=stop (someone) behaving badly):

    The work will keep you out of mischief.

    1. b.
      trouble or disagreement that someone deliberately causes
      make mischief:

      The newspapers were accused of making mischief.

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