warned; warning; warns
Synonyms of warnnext

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.
Speaking at an International Monetary Fund meeting in Washington last week, China's central bank governor Pan Gongsheng warned that rising geopolitical tensions, protectionism, and trade barriers have weighed on global growth and fuelled financial market volatility. Anniek Bao, CNBC, 20 Apr. 2026 In a letter, federal aviation authorities warned the county that the land purchased with federal funds carried an obligation that included operating the property as an airport unless the FAA formally released it. Ruben Vives, Los Angeles Times, 20 Apr. 2026 If Axiom Space’s work encounters further delays, the report warns, both types of suits are likely to be available no earlier than 2031. Claire Cameron, Scientific American, 20 Apr. 2026 The lengthening deployments come as Ukrainian commanders in other units have warned of personnel issues, acknowledging that the army will never match the manpower of Russia’s far larger military force. Daria Tarasova-Markina, CNN Money, 20 Apr. 2026 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

Browse Nearby Words

Cite this Entry

“Warn.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/warn. Accessed 27 Apr. 2026.

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

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