get cold feet
US /ɡɛt koʊld fiːt/
UK /ɡɛt koʊld fiːt/

1.
退縮, 臨陣退縮
to suddenly become too frightened to do something you had planned to do
:
•
He was going to ask her to marry him, but he got cold feet at the last minute.
他本來要向她求婚,但最後一刻退縮了。
•
I was going to try bungee jumping, but I got cold feet when I saw the height.
我本來要去嘗試蹦極,但看到高度後退縮了。