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Meaning of “know best” in the English Dictionary

"know best" in British English

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know best

C2 to be the most suitable person to have responsibility and make important decisions: When it comes to dealing with my own son, I think I know best.
(Definition of know best from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"know best" in American English

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know best

to have opinions that should be accepted and respected by other people: Mom knows best when it comes to investing money.
(Definition of know best from the Cambridge Academic Content Dictionary © Cambridge University Press)
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