once and for all
Meaning: If you do something once and for all, you do it in a way that's final and it means you'll never have to do it again.
- Jim said he's decided once and for all that he's going to stay single and never get married again.
- I was tired of getting new glasses every few years so I decided to solve my eyesight problem once and for all and have laser surgery.
I'm tired of having to get my teeth fixed all the time, so I've decided to solve the problem once and for all by