n.
俄式轮盘

[ noun ]
a stunt in which you spin the cylinder of a revolver that is loaded with only one bullet and then point the muzzle at your head and pull the trigger
<noun.act>

Russian roulette \Rus"sian roulette\
(a) An act of bravado played by loading one bullet into one
chamber of a revolver in which the cylinder has five or
six positions, spinning the cylinder (thus moving the
bullet randomly to one of the six positions of the
cylinder), pointing the gun to one's head, and pulling
the trigger. If the bullet is in firing position, the
"player" is usually killed. Such a "game" may be played
on a dare, or, in some places, as part of a gamble.
(b) (Fig.) Any dangerous act resembling Russian roulette in
the acceptance of a high risk of serious negative
consequences, usually unnecessarily. ``The congress is
playing Russian roulette with the economy by enacting
such large tax reductions without spending cuts.''
[PJC]