for good

US /fɔr ˈɡʊd/
UK /fɔr ˈɡʊd/
"for good" picture
1.

na zawsze, na dobre

permanently; for always

:
She left the country for good.
Wyjechała z kraju na zawsze.
I'm quitting smoking for good this time.
Tym razem rzucam palenie na dobre.