get cold feet

To suddenly become to frightened to do something you had planned to do, especially something important like getting married.

1) We're getting married next Saturday, that's if Trevor doesn't get cold feet!

2) I'm worried she may be getting cold feet about our trip to Panama.

by Sebas4ever March 31, 2014

have (or get) cold feet

to become afraid, to have second thoughts

This is no time to get cold feet.

by Light Joker September 5, 2005