warn
verb (used with object)
to give notice, advice, or intimation to (a person, group, etc.) of danger, impending evil, possible harm, or anything else unfavorable.
has warned
-
present perfectof warn (3rd person singular).present perfect
Used to describe actions that started in the past and continue into or have direct relevance to the present.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Heathrow Airport has warned access to Terminals 2 and 3 is restricted because of flooding.
From BBC ● Aug. 15, 2026
Water levels on the Rhine have dropped even further this week, and Germany's inland shipping association has warned that the waterway could become unnavigable in places.
From Barron's ● Aug. 13, 2026
Lives are being put at risk because of refuse fires sparked by people incorrectly binning their batteries and electrical goods in household waste, a union boss has warned.
From BBC ● Aug. 13, 2026
In a 6,500-word essay published on Monday, Zuckerberg sought to contrast his vision for AI with those of Anthropic CEO Dario Amodei, who has warned about the potential for job disruption.
From MarketWatch ● Aug. 10, 2026
Dr. W. C. Hueper of the National Cancer Institute has warned that “the danger of cancer hazards from the consumption of contaminated drinking water will grow considerably within the foreseeable future.”
From "Silent Spring" by Rachel Carson
