poster child
Americannoun
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a child appearing on a poster for a charitable organization.
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a person or thing that exemplifies or represents.
She could be a poster child for good sportsmanship.
Etymology
Origin of poster child
First recorded in 1990–95
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.