once and for all
/W AH1 N S AE1 N D F AO1 R AO1 L/adverb
- 1
Finally, permanently, conclusively.
โThey replaced the entire door, in hopes of correcting the sticking and squeaking once and for all.โ
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Source: https://en.wiktionary.org/wiki/once%20and%20for%20all