punching bag
noun
punch·ing bag
ˈpən-chiŋ-
plural punching bags
1
: a stuffed or inflated bag (such as a heavy bag or speed bag) usually suspended for free movement and punched or kicked for exercise or for training (as in boxing or martial arts)
When Marciano worked out with a punching bag he saw his opponent before him …—Joyce Carol Oates
… delivering a powerful roundhouse kick to the punching bag …—Caleb Taylor
2
: one who is routinely subjected to criticism, blame, abuse, or defeat by another
The downside of management is that there are no thank you's. … You are subject to the whims and emotions of your artist twenty-four hours a day. You're the guy who becomes the punching bag when things don't go right.—Tommy Motolla, quoted in Off the Record
Exactly what makes Big Business such a convenient punching bag depends on your ideological leanings.—Catherine Rampell
Love words? Need even more definitions?
Merriam-Webster unabridged



