Definition of poster child in English:

poster child

Syllabification: post·er child
(or poster boy or poster girl)

noun

North American
  • A person or thing that epitomizes or represents a specified quality, cause, etc.: the organization is the poster child for bad business deals
    More example sentences
    • We made him a poster boy for bad behavior, put him all over newspapers and milk cartons, and now we should go out and get him.
    • Someone is sure to nail you against the wall and call you the poster boy for Bloggers Gone Bad if you do.
    • Were there an Over-Clickers Anonymous, I could be their poster child.

Origin

1930s: from the use of appealing children in charitable print advertisements.

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