一発勝負

いっぱつしょうぶ

noun

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contest decided by a single round (bout), contest decided by a single roll of dice, one-shot game (contest), make-or-break game(yojijukugo)

一	one, one radical (no.1)
発	departure, discharge, publish, emit, start from, disclose, counter for gunshots
勝	victory, win, prevail, excel
負	defeat, negative, -, minus, bear, owe, assume a responsibility