The phrase "youngest debutant" refers to a person who makes their first appearance or debut in a certain field or activity at a very young age compared to others. Full definition
The Netherlands had a number of young debutants in their side, too, but the only one to really make an impact was a late introduction in Memphis Depay. (sbnation.com)
Corbet draws an incredible performance out of young debutant Tom Sweet. (filmireland.net)
France gained a surprisingly easy victory over the Netherlands as the visitors» young debutants failed to make an impact against a very solid Les Bleus side. (sbnation.com)