American English

Definition of poster child noun from the Oxford Advanced American Dictionary

     

    poster child

     noun
    noun
     
    (also poster boy, poster girl)
     
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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 the Oxford Advanced Learner's Dictionary entry: poster child