Etymology
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warn (v.)

Old English warnian "to give notice of impending danger," also intransitive, "to take heed," from Proto-Germanic *warōnan (source also of Old Norse varna "to admonish," Old High German warnon "to take heed," German warnen "to warn"), from PIE root *wer- (4) "to cover." Related: Warned; warning.

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Definitions of warn

warn (v.)
advise or counsel in terms of someone's behavior;
I warn you against false assumptions
I warned him not to go too far
She warned him to be quiet
Synonyms: discourage / admonish / monish
warn (v.)
ask to go away;
The old man warned the children off his property
warn (v.)
notify, usually in advance;
I warned you that I would ask some difficult questions
From wordnet.princeton.edu