0 a bag filled with material or air, hung from a frame or attached to a stand and used by boxers and others for training or exercise:
Some men get drunk, come home, and use their wife and children as a punchbag.
The man, who was beaten for hours and used as a punchbag, pleaded for mercy.
The politician remarked, "I'm a human being, I'm not a punchbag - I've got feelings."
After nine years as the country's favourite punchbag it's amazing that the Prime Minister's wife had any spirit left in her at all.
