warn
US /wɔːrn/
UK /wɔːrn/

1.
avertir, prévenir
to inform someone in advance of a possible danger, problem, or unpleasant situation
:
•
We tried to warn them about the approaching storm.
Nous avons essayé de les avertir de l'approche de la tempête.
•
I warned him not to touch the hot stove.
Je l'ai averti de ne pas toucher la cuisinière chaude.
2.
conseiller, informer
to give someone advice or information about something, especially something that might be useful or helpful
:
•
The doctor warned him against smoking.
Le médecin l'a averti de ne pas fumer.
•
She warned me that the road would be slippery.
Elle m'a prévenue que la route serait glissante.