professional debut
Refers to the first professional appearance or performance, especially in entertainment, sports, or arts.
彼女は来月、歌手としてプロデビューする。
She will make her professional debut as a singer next month.
He won his professional debut match right away.
Variant with interpunct; less common but seen in some contexts.
Wasei-eigo compound of プロ (professional) and デビュー (debut).