- Warn is defined as to tell or caution against danger.
An example of warn is to tell someone that there is a slippery road ahead.
This sign warns of a slippery road.
warn definition by Webster's New World
- to tell (a person) of a danger, coming evil, misfortune, etc.; put on guard; caution
- to caution about certain acts; admonish: warned against smoking in the building
- to notify in advance; inform
- to give notice to (a person) to stay or keep (off, away, etc.)
Origin: Middle English warnien ; from Old English wearnian ; from Indo-European base an unverified form wer-, to heed from source guard
- warner noun
warn definition by American Heritage Dictionary
verb warned, warn·ing, warns verb, transitive
- To make aware in advance of actual or potential harm, danger, or evil.
- To admonish as to action or manners.
- To notify (a person) to go or stay away: warned them off the posted property.
- To notify or apprise in advance: They called and warned me that they might be delayed.
Origin: Middle English warnen, from Old English warnian; see wer-4 in Indo-European roots.
- warnˈer noun