To have the courage to act boldly and to take full responsibility for one's actions; to be bold in doing things and equally bold in facing the consequences.
队长犯了错误，但他敢作敢当，立刻向大家道歉并提出补救措施。
The team leader made a mistake, but he dared to act and take responsibility, immediately apologizing to everyone and proposing remedial measures.
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