noun
Russian roulette
A deadly game of chance where a revolver loaded with one round is spun and fired at one's own head. Also used figuratively for any extremely risky gamble.
彼らはロシアンルーレットのような危険な賭けをした。
They made a dangerous bet, like Russian roulette.
Variant with interpunct; less common but still seen.
Borrowed from English 'Russian roulette', itself a calque from Russian.