To abandon, give up, or refuse to do something out of cowardice. Tom was supposed to keep a look out while I robbed the liquor store, but he punked out at the last minute.He talked a big talk, but he punked out the moment I stood up to fight him.
punk out
Sl. to chicken out (of something); to withdraw from something in cowardice. He was supposed to ask her out, but he punked out at the last minute.Come on! Stick with it! Don't punk out!
punk out
1. in. to chicken out. He was supposed to ask her out, but he punked out at the last minute.
2. in. to become a punker. If my kids ever punked out and looked like that, I think I’d clobber them.