warn about

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
References in periodicals archive ?
They argued that the distillers had failed to warn about the dangers of drinking during pregnancy.