いじ苛ijiめるmeruいじ虐ijiめるmeru
1.
To intentionally inflict suffering or distress on someone perceived as weaker, often for one's own amusement.
2.
To treat someone in a harsh or excessive manner beyond what is considered reasonable or just.
3.
To bother or harass someone with persistent taunts or teasing, causing emotional discomfort.
Example:
私は彼をいじめたことを後悔した。