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.
have warned
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present perfectof warn.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.
The three unions involved in talks have warned of strikes between August 7 and September 2.
From Barron's ● Aug. 15, 2026
Experts have warned that due to climate change, this is to be expected.
From Barron's ● Aug. 11, 2026
Federal agencies have warned for years that American water systems are particularly vulnerable to foreign hackers and other bad actors.
From The Wall Street Journal ● Aug. 8, 2026
All of these companies have warned consumers that bad actors will continue to pretend to be something they’re not.
From MarketWatch ● Aug. 4, 2026
I suppose anyone who knew the whole story would have warned me off, but the fact was, nobody did know.
From "The Secret History" by Donna Tartt
