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Meaning of “warn” - Learner’s Dictionary

warn

verb [T]     /wɔːn/
OF DANGER
B1 to tell someone that something bad may happen in the future, so that they can prevent it: [+ that] I warned you that it would be cold but you still wouldn't wear a coat. I've been warning him for months.Threats and warnings
ADVISE
to advise someone not to do something that could cause danger or trouble: [+ to do sth] I warned you not to tell her.Threats and warnings
(Definition of warn from the Cambridge Learner’s Dictionary © Cambridge University Press)
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