once and for all

Adverb

idiomatic not-comparable

(idiomatic) Finally, permanently, conclusively.

Japanese Meaning

最終的に / 永久に / 決定的に

After years of arguing, they decided to settle the matter once and for all.

何年もの議論の末、彼らはその問題を最終的かつ恒久的に解決することにした。

Sense（1）

(idiomatic) Finally, permanently, conclusively.

They replaced the entire door, in hopes of correcting the sticking and squeaking once and for all.