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

british 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 daily intake 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)