- Endanger is defined as to expose someone to danger.
When you drive 100 miles per hour on a windy road with your friend in the car, this is an example of when you endanger your friend.
- to expose to danger, harm, or loss; imperil
- to threaten with extinction
transitive verben·dan·gered, en·dan·ger·ing, en·dan·gers
- To expose to harm or danger; imperil.
- To threaten with extinction.