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.
On top of the existing tsunami warning, the center also issued a threat advisory for Cuba, Honduras and the Cayman Islands. Yaakov Katz, Newsweek, 9 Feb. 2025 But people who work in civil rights warn the firings are part of a broad attempt to dismantle the infrastructure for addressing systemic inequalities in America. Andrea Hsu, NPR, 9 Feb. 2025 Confusion, tears and 'Hunger Games' at USAID as agency prepares to go dark Current and former officials warn that dismantling USAID could create a global vacuum that could be filled by U.S. adversaries like China. Isabel Danzis, ABC News, 9 Feb. 2025 Law enforcement officials warned Trump last year that Tehran had placed operatives in the U.S. with access to surface-to-air missiles. Alex Isenstadt, Axios, 9 Feb. 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

Dictionary Entries Near warn

Cite this Entry

“Warn.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/warn. Accessed 14 Feb. 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

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!