惩前毖后懲前毖後

chéng qián bì hòu

Meaning

lit. to punish those before to prevent those after (idiom); to criticize former mistakes firmly to prevent them happening again

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Characters

惩chéngto discipline, to punish, to reprimand, to warn征心前qiánin front, forward; former, preceding丷一刖毖bìcaution; to guard against, to take care比必后hòuafter; behind, rear; descendants口