know better
to be smart or sensible enough not to do something
▪ You walked home alone? Don't you know better (than that)? ▪ She'll know better than to trust them again. [=she will not trust them again] ▪ There's no excuse for his behavior. He's old enough to know better. ▪ Don't blame him. He's just a child and he doesn't know (any) better. [=he is too young, inexperienced, etc., to be expected to behave properly]

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