Forewarn in spanish
Prevenir
pronunciation: pɹ̩ebeniɹ̩ part of speech: verb
pronunciation: pɹ̩ebeniɹ̩ part of speech: verb
In gestures
forewarn = avisar, prevenir, advertir.
Example: I think a person would be derelict in his or her duty not to forewarn someone about a problem.