punishment by striking with fists; fist punishment
A yojijukugo referring to physical punishment or discipline delivered by punching or beating with the fists. Often used in contexts of strict, sometimes violent, enforcement of rules, such as in sports teams, schools, or gangs.
It is said that in the old military, punishment by fists was a daily occurrence.
彼は後輩に鉄拳制裁を加えた。
He administered fist punishment to his junior.