one and out

Noun

uncountable

(sports) a type of elimination playoff series that is a single-game series, to decide who wins the playoff round

Japanese Meaning

スポーツにおいて、単一試合でプレーオフの勝者を決定し、敗者がそのラウンドから即座に敗退する形式のエリミネーション方式

Tomorrow's semifinal is a one and out, so the loser will be eliminated.

明日の準決勝は一試合決着の勝ち抜き戦で、敗者は大会から脱落します。

Sense（1）

(sports) a type of elimination playoff series that is a single-game series, to decide who wins the playoff round