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hero

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noun [countable] British English pronunciation: hero /ˈhɪərəʊ/ 
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singularhero
pluralheroes
  1. 1
    someone who has done something brave, for example saving a person's life or risking their own life

    a war hero

    The sisters were treated as local heroes after rescuing a two-year-old boy from drowning.

    unsung hero (=a hero who has not been praised or recognized):

    He was one of life's unsung heroes.

    See also  folk hero

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