once and for all
CONCLUSIVELY, decisively, finally, positively, definitely, definitively, irrevocably, for good, for always, forever, permanently

[TahlilGaran] Dictionary of Contemporary English ▲

once and for all
completely and finally.
I wish we could settle the matter once and for all.

[TahlilGaran] English Idioms Dictionary ▲

once and for all
permanently, finally
I told my friend once and for all that I would not give him any money.

[TahlilGaran] English Idioms Dictionary ▲

once and for all
adv. phr.
1. One time and never again; without any doubt; surely; certainly; definitely.
Let me say, for once and for all, you may not go to the party Saturday.
For once and for all, I will not go swimming with you.
2. Permanently.
Bill and Tom asked the teacher to settle the argument once and for all.
The general decided that two bombs would destroy the enemy and end the war once and for all.

[TahlilGaran] English Idioms Dictionary ▲