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:
“Some critics are like chimneysweepers; they put out the fire below, and frighten the swallows from the nests above; they scrape a long time in the chimney, cover themselves with soot, and bring nothing away but a bag of cinders, and then sing out from the top of the house, as if they had built it.”
—Henry Wadsworth Longfellow (1807–1882)