also: ワンダウン
noun
one down; one out
Baseball term for having one out in an inning. Used in scorekeeping and commentary.
See also: ワンナウト
ワンダンでランナーは二塁です。
With one out, the runner is on second base.
ワンダンからヒットが出てチャンスが広がった。
A hit with one out expanded the scoring opportunity.