一いっ回かい勝しょう負ぶ

noun

single-round contest; one-shot game; make-or-break match

Refers to a contest, game, or gamble decided by a single round, roll, or attempt, with no second chance. Often carries a high-stakes, all-or-nothing nuance.

• 決けっ勝しょうは一いっ回かい勝しょう負ぶで、負まけたら終おわりだ。

  The final is a single-round contest; if you lose, it's over.

• サイコロの一いっ回かい勝しょう負ぶで勝しょう敗はいを決きめよう。

  Let's decide the winner with a single roll of the dice.