noun
inside-the-park home run; running homer
Baseball term for a home run where the batter circles all bases without the ball leaving the field of play.
彼は足の速さを活かしてランニングホーマーを打った。
He used his speed to hit an inside-the-park home run.
Variant with interpunct; less common in running text.
ホームラン is the general term for a home run, while ランニングホーマー specifically refers to an inside-the-park home run.
Borrowed from English 'running homer'.