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1. Oxford American Dictionary

   knuckleball

   • IPA[ˈnəkəlˌbôl]

   美式

   • n.
     a slow pitch that has virtually no spin and moves erratically, typically made by releasing the ball from between the thumb and the knuckles of the first joints of the index and middle finger.

   • noun: knuckleball, plural noun: knuckleballs

2. • 更多解釋

   knuckleball

   • IPA[ˈnʌklbɔːl]

   英式

   • n.
     a slow pitch which moves erratically, made by releasing the ball from the knuckles of the first ...

   Oxford Dictionary