once and for all

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

一勞永逸地, 徹底地

finally and definitively; for the last time

:
Let's settle this argument once and for all.
讓我們一勞永逸地解決這場爭論。
I want to finish this project once and for all.
我想一勞永逸地完成這個項目。