be known to be/do sth Meaning in the Cambridge English Dictionary
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Meaning of “be known to be/do sth” in the English Dictionary

"be known to be/do sth" in British English

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be known to be/do sth

C1 If something or someone is ​known to be or do something, ​people know that it is ​true or ​happens, or that someone is or does something: A ​dailyintake of 20 mg of ​vitamin C is ​known to be ​sufficient in most ​cases to ​ward off ​scurvy.
(Definition of be known to be/do sth from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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