forewarn about

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forewarn (someone) about (something)

To inform someone of something in advance. Thanks for forewarning me about the boss's foul mood today—I made sure to steer clear of him.
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forewarn someone about something

 and forewarn someone of something
to warn someone about someone or something. They forewarned us of your strange behavior. Didn't we forewarn you about Max's problem?
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References in periodicals archive ?
Abu Dhabi: India is experimenting with systems to forewarn of earthquakes which still remain a mystery to science and technology, a senior Indian scientist told Gulf News in an interview.
The Mufti of Al-Quds, issued a statement which, was quoted by the Palestinian News Agency (WAFA), said that this step comes in the aftermath of recently increasingly-growing Israeli occupation's transgressions which forewarn of dire ramifications.
Identify legitimate but clear signals that will forewarn of change taking place.
Though theses 4-inch-wide patches brighten the underwater landscape, they also forewarn of the spread of coralline lethal orange disease (CLOD), says Diane S.
Known as the maspin gene because it codes for the protein maspin, this gene's activity -- or rather inactivity -- may forewarn of cancer on the brink of spreading, says Ruth Sager of Boston's Dana-Farber Cancer Institute.