To get cold feet means to suddenly become too frightened to do something you had planned to do.
Fear of doing something; cowardice at the moment of action.
A wave of timidity or fearfulness.
1. Garrett and I have set our wedding date, but I think I’m getting cold feet.
2. Vince and I are taking our first trip next weekend and I’m worried that he’s getting cold feet.
3. I’ve been looking forward to skydiving but got cold feet last minute!
4. I got cold feet before the final exam and I think I did poorly.
anxiety, apprehension, backing out, chicken heart, doubt, faint heart, fear, feat of carrying out an activity, reservations, second thoughts, timidity, weak knees, white feather, yellow streak