B1verbhealthlanguage
US/wɔːrn/
UK/wɔːn/
to tell someone about a possible danger or problem so they can avoid it
In context
Doctors warn that too much screen time can hurt children's eyes.
My friend warned me not to eat at that restaurant.
The sign on the mountain road warns drivers about falling rocks.
Words that go with warn
verb + preposition
- warn aboutThe teacher warned us about cheating.
- warn ofExperts warn of a possible flood.
- warn againstPolice warn against walking alone at night.
- warn not toI warned him not to touch the stove.
adverb + verb
- strongly warnThe doctor strongly warned him to stop smoking.
Common mistakes
Incorrect:
I warned to him about the dog.Correct: I warned him about the dog.