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Noun: poster child (poster children)
  1. Someone who is a typical or quintessential example of something, or is used represents a particular cause or ideal
  2. A child afflicted by some disease or deformity whose picture is used on posters to raise money for charitable purposes
    "she was the poster child for muscular dystrophy"

Derived forms: poster children

Type of: child, fry, kid, minor, nestling, nipper, shaver, small fry, tiddler [Brit], tike, tyke, wean [UK, Ireland], youngster

Encyclopedia: Poster child