once and for all

US /wʌns ænd fɔr ɔl/
UK /wʌns ænd fɔr ɔl/
"once and for all" picture
1.

一劳永逸地, 彻底地

finally and definitively; for the last time

:
Let's settle this argument once and for all.
让我们一劳永逸地解决这场争论。
I want to finish this project once and for all.
我想一劳永逸地完成这个项目。