Definition of punchball noun from the Oxford Advanced Learner's Dictionary

 

punchball

 noun
noun
BrE BrE//ˈpʌntʃbɔːl//
 
; NAmE NAmE//ˈpʌntʃbɔːl//
 
 
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a heavy leather ball, fixed on a spring, which is punched, especially by boxers as a part of training, or as a form of exercise
See the Oxford Advanced American Dictionary entry: punchball