punked out (synonym: herbed)

To back out of something you said you were going to do. No it doesn't mean backdown from a challenge or someone else that makes no sense. Backdown means to say no to something back out means you say u were gonna do something but then u dont do it. :/

punked out (synonym: herbed): Tyler and Kevin were gonna fight at the park after school but Tyler punked out and went home instead.