To make the final, decisive statement or decision, especially after much discussion or deliberation.
大家讨论了很久，最终还是由经验丰富的主管千锤打锣，一锤定音，确定了这次活动的具体方案。
After a long discussion among everyone, it was ultimately the experienced supervisor who, with a decisive statement, finalized the specific plan for this event.
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