“掷币赌胜负”可以翻译为 "flipping a coin to decide the winner/loser" 或 "betting on the outcome of a coin toss"。
"flipping a coin to decide the winner/loser" 侧重于描述通过掷硬币这一行为来确定胜负双方。
"betting on the outcome of a coin toss" 则更强调对掷硬币结果的押注行为。
两者均可根据具体语境选择使用。