Russian roulette noun
Learner's definition of RUSSIAN ROULETTE
[noncount]
: a dangerous game in which people fire a gun with a single bullet at their heads without knowing if the bullet will be shot or not俄罗斯轮盘赌(一种危险游戏,玩家用只装了一发子弹的左轮手枪对着自己头扣动扳机,不知道子弹是否会射出) —
often used figuratively常用作比喻