いじめる

彼は小学生の頃、上級生にいじめられていた。

In elementary school, he was bullied by older students.

弱い者をいじめるのは卑怯だ。

Picking on the weak is cowardly.

大会前は毎日体をいじめるような練習を続けた。

Before the tournament, I kept up training that pushed my body to the limit every day.