punching bag

From Wiktionary

Noun[change]

Singular
punching bag

Plural
punching bags

A man hitting a punching bag
  1. (countable) A punching bag is a bag used for punching, kicking or boxing.
    The punching bag is filled with sand.
  2. (countable) (informal) A punching bag is a person that is abused or bullied.
    The bully uses Tim as a punching bag whenever he is upset.

Related words[change]