dare
n. countable B2 Upper Intermediate Oxford US //ˈdɛɹ// UK //dˈeə// dare
n. a challenge to do something brave or silly to prove you are not afraid. You usually do this because someone else tells you to.
n. a challenge or provocation intended to test someone's courage or willingness to act. Often used in social contexts among peers to compel a specific behavior.
I jumped into the cold lake on a dare.
She accepted the dare to sing a song in front of the entire office during the party.
What began as a harmless childhood dare eventually evolved into a lifelong passion for high-altitude mountaineering and extreme sports.
Usage
Commonly used in the prepositional phrase 'on a dare'.