From Longman Dictionary of Contemporary EnglishI’ve known somebody/something to do somethingI’ve known somebody/something to do something or somebody/something has been known to do somethingSOMETIMES used to say that someone does something sometimes or that something happens sometimes, even if it is unusual People have been known to drive 500 miles just to visit the shop. This type of fish has been known to live for 10 years or more. → know
