Definitions from Wiktionary (eight-ball)

▸ noun:  (uncountable) A pocket billiards (pool) game played with sixteen balls (a cue ball and fifteen object balls) on a pool table with six pockets.
▸ noun:  (countable) The billiard ball, almost always black, bearing the number eight.
▸ noun:  (countable, slang) A portion of cocaine or methamphetamine weighing ¹⁄₈ of an ounce, or 3.5 grams.
▸ noun:  (countable, slang, ethnic slur) A black person.
▸ noun:  (countable, aviation, slang) A spherical attitude indicator.
▸ noun:  (countable, broadcasting) A kind of spherical microphone.
▸ verb:  (pool, transitive) To outplay (an opponent) by potting all one's color balls and then the black (or eight-ball) without the opponent potting a single one.

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