Meaning of “know better (than to do sth)” in the English Dictionary

british dictionary

"know better (than to do sth)" in British English

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know better (than to do sth)

C2 to be wise or moral enough not to do something:

Sure, she's only six, but she's old enough to know better than to run off without us.
I'm surprised at you behaving so badly - you ought to/should know better.

(Definition of “know better (than to do sth)” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

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