To make (someone) aware of (something impending); especially:
We waved a flag to warn the oncoming traffic about the accident.
To caution or admonish (someone) against unwise or unacceptable behaviour.
He was warned against crossing the railway tracks at night.
To advise or order to go or stay away.
A sign warns trespassers off/away from the site.
A surname.
From Middle English warnen, warnien (“to warn; admonish”), from Old English warnian (“to take heed; warn”), from Proto-Germanic *warnōną (“to warn; take heed”), from Proto-Indo-European *wer- (“to be ...
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