expression, noun
bad deed; evil act
A straightforward phrase for a morally wrong or harmful action. Used in both everyday and serious contexts.
悪い行いをすると、いつか自分に返ってくるよ。
If you do bad deeds, they'll come back to you someday.
彼は自分の悪い行いを反省している。
He is reflecting on his own wrongdoing.