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What does knuckleball mean?

Looking for the meaning or definition of the word knuckleball? Here's what it means.

Noun
  1. (baseball) A pitch thrown with the ball gripped on the fingertips and released with no rotation, which travels over an unpredictable path to the plate due to micro-turbulence in the air.
  2. (figuratively) An event that is hard to predict.
Verb
  1. (intransitive, baseball) To pitch knuckleballs.
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