Definitions from Wiktionary (knuckleball)

▸ noun:  (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.
▸ noun:  (cricket) A type of delivery where a fast bowler holds the ball on the knuckles of the index and middle fingers.
▸ noun:  (figurative, informal) An event that is hard to predict.
▸ verb:  (intransitive, baseball) To pitch knuckleballs.



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