Meaning of “Russian roulette” in the English Dictionary

british dictionary

"Russian roulette" in British English

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Russian roulettenoun [ U ]

uk /ˌrʌʃ.ən ruːˈlet/ us /ˌrʌʃ.ən ruːˈlet/

a very dangerous game of chance where each player aims at their own head with a gun that has one bullet in it and five empty chambers (= spaces where bullets could go)

the action of taking very serious risks with something important:

Farmers are being forced to play / Russian roulette with their futures.
Buying medication off the Internet is a game of Russian roulette.

(Definition of “Russian roulette” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)