tr.v. warned, warn·ing, warns
1. To notify or make aware in advance of something, especially of possible danger or misfortune: warned boaters of the coming storm; warned me that they might be delayed.
2. To make known (a warning): warned that the bolts needed to be replaced.
3. To advise or caution (someone) about a course of action: warned us to be careful; warned us not to stay up too late.
4. To notify (a person) to go or stay away: The ranger warned hikers away from the cliff.
[Middle English warnen, from Old English warnian; see wer-4 in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2017 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The American Heritage Dictionary Blog
Check out our blog, updated regularly, for new words and revised definitions, interesting images from the 5th edition, discussions of usage, and more.
American Heritage Dictionary Products
The American Heritage Dictionary, 5th Edition
The American Heritage Dictionary of Idioms
The American Heritage Roget's Thesaurus
Curious George's Dictionary
The American Heritage Children's Dictionary
The American Heritage Dictionary of Indo-European Roots
The American Heritage Student Grammar Dictionary
The American Heritage Desk Dictionary + Thesaurus
The American Heritage Science Dictionary
The American Heritage Dictionary of Business Terms
The American Heritage Student Dictionary
The American Heritage Essential Student Thesaurus