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to resign; to retire; to quit; to leave (one's job, etc.)
来月で会社を辞めるつもりです。
I plan to quit the company next month.
仕事を辞めて新しい道に進む。
I will quit my job and move on to a new path.
彼女は健康のため仕事を辞めた。
She quit her job for health reasons.