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.
Republican operatives at the time warned that outsourcing the ground game to outside groups could pose risks for future cycles, but Kirk and his team described the results as vindication. Samantha-Jo Roth, The Washington Examiner, 25 Sep. 2025 Climate scientist Johan Rockström, speaking at a science briefing that opened the summit, warned that warming appears to be accelerating. Aamir Khollam, Interesting Engineering, 25 Sep. 2025 The shocking incident triggered outrage among Haitians, aid workers and security experts who have been quietly warning of the dangers of the Haitian government using explosive drones to target leaders of criminal gangs. Jacqueline Charles, Miami Herald, 24 Sep. 2025 Scientists have warned for years that climate change is happening and that it is mainly caused by fossil fuel pollution. Alexandra Banner, CNN Money, 24 Sep. 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 29 Sep. 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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