Meaning of “warn” - Learner’s Dictionary


verb [ T ] uk us /wɔːn/

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.

to advise someone not to do something that could cause danger or trouble:

[ + to do sth ] I warned you not to tell her.

(Definition of “warn” from the Cambridge Learner’s Dictionary © Cambridge University Press)