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.
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.