If you get cold feet or have cold feet about something you have planned to do， you become nervous about it and not sure that you want to do it.

如果你對某個你計劃要做的事get cold feet或者是have cold feet，就表示你對你計劃要做的這個事感到膽怯、緊張，不確定你是否想做它。

I had agreed to give a speech， but as the time approached， I began to get cold feet.

我已經答應進行一次演說，但隨著時間的逼近，我開始膽怯了。

A：I’m scared。 I’m not sure I want to go through with it.

A：我害怕。我不確定自己想不想去了。

B：We didn’t drive all the way down here for that piece of paper for you to get cold feet at the last second.

B：我們開了這么遠的路來拿證明，可不是為了讓你臨陣脫逃的。