get cold feet
to become afraid and hesitant about something at the last minute
The student got cold feet and cancelled his plans to go to China.
This mound of shimmering spheres looks like snowballs just waiting to be thrown. Arranged in an urn beside the front door, the spheres are plugged into a power strip hidden inside, then stacked and accented with boxwood greenery. A single strand of fishing line wrapped around the spheres keeps the stack secure.