have the final say 有决定权；发言权；说了算；有最终决定权；拍板

【例句】
The judge has the final say on the sentence.
法官对判决有最后的决定权。

But he only agreed to take the job if they let him have the final say.
不过他说只有他们让他有最终决定权，他才会接受这个职位。