Wiktionary
wimp out
vb. To behave like a wimp.
Usage examples of "wimp out".
If she was going to drag Miles all the way up to the back of beyond and then wimp out on him.
If she was going to drag Miles all the way up to the back of beyond and then wimp out on him .
He could not recall ever seeing this little Air Force wimp out doing roadwork.
I really should start wearing bolder colors, but I always wimp out with pastels.
And because if you wimp out and try to run off with that bracelet on, you're gonna do it with my bullet in your head.