warned; warning; warns

transitive verb

1
a
: to give notice to beforehand especially of danger or evil
b
: to give admonishing advice to : counsel
c
: to call to one's attention : inform
2
: to order to go or stay away
often used with off
warner noun

Examples of warn in a Sentence

I had been warned about the difficulties of the job. She warned me that the stove was still hot. “This won't be easy,” he warned. Nobody warned me about the dangers. I warned him to be careful, but he didn't listen to me. She warned us not to go too close to the fire.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
While the spillway will remain active for another several weeks, the Bureau of Reclamation is currently warning motorists that there will likely be increased traffic and congestion along State Route 128 due to current public interest in the site. Toria Sheffield, People.com, 29 Mar. 2025 But national advocates warn treatment is underfunded, especially compared to the billions of dollars of investment that the federal government puts into resources for addiction to alcohol, tobacco and other substances. Katia Riddle, NPR, 29 Mar. 2025 Dental experts warn that the simultaneous erosion of Medicaid and fluoridation could exacerbate a crisis of rural oral health and reverse decades of progress against tooth decay, particularly for children and those who rarely see a dentist. Brett Kelman, CNN Money, 29 Mar. 2025 For this reason, Sweet warns against getting too attached to labels like twin flame or even soulmate. Christina Pérez, Vogue, 29 Mar. 2025 See All Example Sentences for warn

Word History

Etymology

Middle English warnen, going back to Old English wearnian, warnian "to be on one's guard, make aware, put on one's guard," going back to West Germanic *warnōjan- (whence Middle Dutch waernen "to provide with, give notice of a danger," Old High German warnōn), probably causative derivative of Germanic *wara- "cognizant, watchful" — more at ware entry 1

First Known Use

before the 12th century, in the meaning defined at transitive sense 1a

Time Traveler
The first known use of warn was before the 12th century

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Cite this Entry

“Warn.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/warn. Accessed 2 Apr. 2025.

Kids Definition

warn

verb
1
a
: to give notice to beforehand especially of danger or evil
b
: to give advice to : counsel
2
: to order to go or stay away
warned us off their land
warner noun

More from Merriam-Webster on warn

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