He was going to ask her but he got cold feet and said nothing.

他本来是想向她提出邀请的，可事到临头他却胆怯得什么也没有说。

《牛津词典》

The Government is getting cold feet about the reforms.

政府在改革上变得紧张胆小。

《柯林斯英汉双解大词典》

People get cold feet. They get a space heater.

人们会手脚冰凉，于是买了小型供暖器，把它插在双交叉的延长线上。

youdao

But there is an expression to get cold feet that has nothing to do with cold or your feet.

VOA: special.2009.12.13

You are likely to get cold feet about being president when you understand the situation.

VOA: special.2009.12.13

As he pulled the door open, a cold rain rushed into the kitchen almost sweeping him from his feet.

VOA: special.2010.09.25

Atari got cold feet, and dropped the idea -- and the game -- before completion.

ENGADGET: blogger-avatar

That reduces the cancellation rates even if prices fall or buyers get cold feet.

WSJ: Deal of the Week: A High-Rising Exposure

But Greece's official creditors have their own reasons to get cold feet about another rescue package.

ECONOMIST: Rescuing Greece