What does "curveball" mean?
A forespin pitch thrown by rotating the index and middle fingers down and resulting in motion down "curve"
noun, verb ·Rare ·Advanced level
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"He bit on a curveball in the dirt."
"Life has thrown him a few curveballs."
"Even though the haughty physics professors at the elite school ridiculed his declaration that he could make a baseball curve, Cummings just laughed it off and said, “I curveballed them to death,” according to Frederick Ivor-Campbell."
"He's a master at the curveball."
A forespin pitch thrown by rotating the index and middle fingers down and resulting in motion down "curve"
He's a master at the curveball.
From curve + ball.