A punching bag is a sturdy bag designed to be repeatedly punched. A punching bag is usually cylindrical, and filled with various materials of corresponding hardness.
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Famous quotes containing the word bag:
“I see every thing I paint in this world, but everybody does not see alike. To the eyes of a miser a guinea is more beautiful than the sun, and a bag worn with the use of money has more beautiful proportions than a vine filled with grapes.”
—William Blake (1757–1827)