punching bag
noun [ C ] US uk/ˈpʌn.tʃɪŋ ˌbæɡ/ us/ˈpʌn.tʃɪŋ ˌbæɡ/ (UK punchball)
（悬挂在空中供练习拳击用的）吊袋，拳击梨球
a leather bag filled with air, hung from a frame or attached to a stand and used by boxers for training or exercise
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