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to ill-treat; to bully; to torment; to pick on; to tease; to be cruel to; to persecute
to be tough on (e.g. one's body); to treat harshly
弱い人をいじめないでください。
Please don't bully.
夜遊びで体を苛めるのはよくない。
Wearing your body down with late nights isn't good.
彼は学校で友達をいじめました。
He bullied his friends at school.