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Wiktionary
punching bag

n. 1 A device, consisting of a tough cloth bag over sand or other material, used to practice punching, boxing or kicking. 2 A person serving as an object of abuse.

WordNet
punching bag
  1. n. a person on whom another person vents their anger; "he resigned because his boss used him as a punching bag"

  2. an inflated ball or bag that is suspended and punched for training in boxing [syn: punch bag, punching ball, punchball]

Wikipedia
Punching bag

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.

Punching Bag (album)

Punching Bag is the fifth studio album by American country music artist Josh Turner. It was released on June 12, 2012 via MCA Nashville. Turner co-wrote eight of the album's eleven tracks. The album includes the singles "Time Is Love" and "Find Me a Baby."

The album debuted at No. 4 on Billboard 200, and No. 1 on the Top Country Albums chart, selling 45,000 copies in its first week. It has sold 209,000 copies in the United States as of March 2015.