tr.v. en·dan·gered, en·dan·ger·ing, en·dan·gers
1. To expose to harm or danger; imperil.
2. To threaten with extinction.
Synonyms: endanger, hazard, imperil, jeopardize, risk
These verbs mean to subject to danger, loss, or destruction: erratic driving that endangers lives; hazarded his health by smoking; a forest imperiled by acid rain; costs that jeopardized profits; wouldn't risk her financial security.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.