after all
after all {adv. phr.}
1. As a change in plans; anyway. — Used with emphasis on "after".
Bob thought he couldn't go to the party because he had too much homework, but he went after all.
2. For a good reason that you should remember. — Used with emphasis on "all".
Why shouldn't Betsy eat the cake? After all, she baked it.
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Source: A Dictionary of American Idioms