noun
submarine pitcher
A baseball pitcher who throws with a sidearm or underhand motion, where the arm drops below the shoulder. The term is used in Japanese baseball commentary and news.
彼はプロ野球で有名なサブマリンピッチャーだ。
He is a famous submarine pitcher in professional baseball.
サブマリンピッチャーの投球は打者にとって打ちにくい。
A submarine pitcher's delivery is difficult for batters to hit.