Poster child
WordNet

noun


(1)   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"
WiktionaryText

Noun


poster child
  1. One who is a prototypical or quintessential example of something.
    He's a poster child for militant vegetarianism.
 
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