To deeply regret one's past mistakes and condemn oneself for them; to repent one's errors and confess one's faults.
他因为年少时的冲动行为而深感悔过自忏，决心以后不再犯同样的错误。
He felt deep regret and self-reproach for his impulsive actions in his youth, resolving never to make the same mistakes again.
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