warn (one) against (something)

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warn (one) against (something)

To caution one not to do something that is dangerous or risky. My mother always warned me against hanging out with hoodlums like you, and now I know why. Doctors are warning people against spending too much time in the sun this week lest they suffer dehydration or sunstroke.
See also: warn

warn someone against someone or something

to advise someone against someone, something, or doing something. We warned them all against going to the region at this time. I warned her against Gerald.
See also: warn

warn against

v.
To advise someone that something is dangerous or problematic and should be avoided: I warned them against driving without seatbelts. The doctor warns against smoking.
See also: warn
References in classic literature ?
If it should happen that you are a woman, who, from whatever cause, has a perverted delight in making a sister-woman as wretched as she is (I am old enough to have heard of such), I warn her against you, and I warn you against yourself.'
Again for the poor creature's own sake, I had met the police-officer with a flat denial, and had declared-- loudly declared, so that she might hear me too--that I felt "no interest whatever in Rosanna Spearman." At those words, solely designed to warn her against attempting to gain my private ear, she had turned away and left the place: cautioned of her danger, as I then believed; self-doomed to destruction, as I know now.