roulette : Idioms & Phrases

• noun a line generated by a point on one figure rolling around a second figure
  roulette.
  

WordNet

• noun the ball used to play roulette
  

WordNet

• noun game equipment consisting of a wheel with slots that is used for gambling; the wheel rotates horizontally and players bet on which slot the roulette ball will stop in
  wheel.
  

WordNet

• 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
  

WordNet

• (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. (a) (Fig.) Any dangerous act resembling Russian roulette in the acceptance of a high risk of serious negative consequences, usually unnecessarily.

Webster 1913