poster child noun
plural ∼ children [count] US 1 : a child who has a particular disease and is shown in posters to raise money to help fight that disease 2 : a person who represents or is identified with something (such as a cause or product)
▪ She was a stirring speaker and activist and soon became the poster child of the antiwar movement. ▪ (humorous) My brother is the poster child for laziness. [=he is very lazy]
▪ She was a stirring speaker and activist and soon became the poster child of the antiwar movement. ▪ (humorous) My brother is the poster child for laziness. [=he is very lazy]
