Definitions for knuckleball
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Princeton's WordNet
knuckleball, knuckler(noun)
a baseball pitch thrown with little speed or spin
Wiktionary
knuckleball(Noun)
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.
knuckleball(Noun)
An event that is hard to predict.
Our vendor keeps throwing us knuckleballs.
knuckleball(Verb)
To pitch knuckleballs.
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"knuckleball." Definitions.net. STANDS4 LLC, 2013. Web. 24 May 2013. <http://www.definitions.net/definition/knuckleball>.