To get cold feet

To panic, to become too frightened to do something

You can use this phrase in ………… language.

Spoken
Written
Informal

Example 1
After promising to take in six prisoners, Uruguayan president seems to be getting cold feet, for he refused to give his permission for the transfer.

Example 2
Mary was getting cold feet about her wedding in the morning, but her mom calmed her down and told her that it was practically normal to be nervous.