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warn about

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warn someone about someone or something

to advise someone about the dangers associated with someone or something. Didn't I warn you about the dangers of going there? I warned you about Alice.

See also: warn

warn about

v.

1. To make someone aware of the actual or potential harm, danger, or evil associated with something: I warned the kids about riding their bikes in the street.

2. To make aware in advance of some actual or potential harm, danger, or evil: The report warned about a possible attack.

See also: warn