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for (one's) (own) good
For one's benefit, even though it may not be enjoyable or desired. I know you're mad that I won't let you eat candy for dinner, sweetheart, but it's for your own good.
1. Permanently; indefinitely; forever. After she found out about his latest relapse with drugs, she decided it was best to leave him for good. He got locked up again—this time for good.
2. For the benefit of others; for purposes that are pure and not evil. It's time you started thinking about using your wealth for good, instead of wasting it on pleasure.
forever; permanently. I finally left home for good. They tried to repair it many times before they fixed it for good.
Also, for good and all. Permanently, forever. For example, I'm moving to Europe for good. [1500s] Also see for keeps.
for ˈgood(British English also for ˌgood and ˈall) permanently; for ever: I’m going away for good. ♢ Today I gave up smoking for good.
Permanently; forever: I'm moving to Europe for good.