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Definition of poster child noun from the Oxford Advanced Learner's Dictionary

poster child

noun
 
/ˈpəʊstə tʃaɪld/
 
/ˈpəʊstər tʃaɪld/
(also poster boy, poster girl)
(especially North American English)
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  1. a 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. (often humorous) a person who is seen as representing a particular quality or activity
    • She is the poster child for incompetent government.
    • He was the poster boy for indie rock.
See poster child in the Oxford Advanced American Dictionary
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