一番勝負

いちばんしょうぶ

noun

•

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)
番	turn, number in a series
勝	victory, win, prevail, excel
負	defeat, negative, -, minus, bear, owe, assume a responsibility