一槌定音

Explanation: With words by referring to the final decision. With the final word. " 　　Source: Ding Zhu can be if "deep Green Lane," the smiling faces, round, long, bitter, sweet, to come and ask for instructions to request all over to help. God, gave the final word, ubiquitous ring. " Thesaurus:  set the tune with one beat of the gong