Definition of knuckleball in English:

knuckleball

Line breaks: knuckle|ball
Pronunciation: /ˈnʌklbɔːl
 
/

noun

Baseball
A slow pitch which moves erratically, made by releasing the ball from the knuckles of the first joints of the index and middle finger.
More example sentences
  • He had pitched in high school and occasionally had thrown a knuckleball.
  • Eddie Cicotte is thought to be the first major league pitcher to specialize in throwing the knuckleball.
  • Sauveur throws a fastball, knuckleball, curveball and cutter, and he changes speeds with all of them.

Derivatives

knuckleballer

noun
More example sentences
  • He was a knuckleballer and may be the last pitcher to start both games of a doubleheader.
  • As a knuckleballer, Sparks could prove invaluable because he'll be available to pitch more often.
  • Unlike many knuckleballers, Wakefield never tried pitching conventionally.

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