Oxford Dictionary English

    poster child

    noun
    noun
    BrE BrE//ˈpəʊstə tʃaɪld//
    ; NAmE NAmE//ˈpoʊstər tʃaɪld//
    (also poster boy, poster girl) (especially North American English)
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  1. 1a child with a particular illness or other problem whose picture appears on a poster advertising an organization that helps children with that illness or problem
  2. 2(often humorous) a person who is seen as representing a particular quality or activity He is the poster child for incompetent government.
See poster child in the Oxford Advanced American Dictionary
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