“Ball boy” in Japanese
Short answer
Ball boy in Japanese is “ボールボーイ” (boorubooi). Full meaning: ball boy.
Other ways to say “Ball boy” in Japanese
ボールパーソン
boorupaason ball person, ball boy, ball girl
球拾い
tamahiroi retrieving balls (during a practice session; in tennis, baseball, etc.), acting as ball boy; ball boy, player (in a tennis club, etc.) assigned the role of ball boy
ボール拾い
booruhiroi retrieving balls (during a practice session; in tennis, baseball, etc.), acting as ball boy; ball boy, player (in a tennis club, etc.) assigned the role of ball boy
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