have the final say

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have the final say

1. To say the final words in an argument or discussion, especially ones that decisively or conclusively end it. The whole meeting just descended into chaos as everyone tried to have the final say. David is so smug and always has to have the final say in every debate.
2. To have the authority to decide how something ultimately happens or is done. As the editor in chief, I have the final say on the layout design for every issue.
See also: final, have, say