"warns" in the verb sense

1. warn

notify of danger, potential harm, or risk

"The director warned him that he might be fired"

"The doctor warned me about the dangers of smoking"

2. warn, discourage, admonish, monish

advise or counsel in terms of someone's behavior

"I warned him not to go too far"

"I warn you against false assumptions"

"She warned him to be quiet"

3. warn

ask to go away

"The old man warned the children off his property"

4. warn

notify, usually in advance

"I warned you that I would ask some difficult questions"

Source: WordNet® (An amazing lexical database of English)

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