a stuffed or inflated ball, supported by a flexible rod, that is punched for exercise, esp boxing training a game resembling baseball in which a light ball is struck with the fist 
WordReference Random House Unabridged Dictionary of American English © 2025
punch•ball 
(punch′bôl′),USA pronunciation n. 
- Gamesa form of playground or street baseball in which a rubber ball is batted with the fist.
 
- punch1 + ball1 1930–35
 
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