eight ball

  1. a black ball with the number eight on it
  2. a form of pool in which a player who inadvertently pockets the eight ball before pocketing all of his or her balls immediately loses the game
    also written 8-ball or eight-ball

See eight ball in American Heritage Dictionary 4

noun
Games
A black pool ball that bears the number eight and that may put a player at a disadvantage.

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eight ball

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